FIN or FIN-ACK packets from client was dropping because the client
side was using conntrack. Connection is in SYN_SENT state because the
response from backends bypass the conntrack, when client sends a FIN
or FIN-ACK, the conntrack is invalid and packet is dropped.
To fix it, remove the client side from conntrack, calculating the hash
from packet to choice the backend.
REG_IDX_LB_STATELESS is used to store the index from backend.

Signed-off-by: Lucas Vargas Dias <[email protected]>
---
 northd/lb.c         |   3 +
 northd/lb.h         |   1 +
 northd/northd.c     | 278 +++++++++++++++++++++++++++++++-------------
 tests/multinode.at  |  99 ++++++++++------
 tests/ovn-northd.at | 218 ++++++++++++++++++++++++++++++++--
 5 files changed, 467 insertions(+), 132 deletions(-)

diff --git a/northd/lb.c b/northd/lb.c
index 919557ec4..2266d76e8 100644
--- a/northd/lb.c
+++ b/northd/lb.c
@@ -358,6 +358,9 @@ ovn_northd_lb_init(struct ovn_northd_lb *lb,
     }
     lb->affinity_timeout = affinity_timeout;
 
+    lb->use_stateless_nat = smap_get_bool(&nbrec_lb->options,
+                                          "use_stateless_nat", false);
+
     const char *snat_ip = smap_get(&nbrec_lb->options, "hairpin_snat_ip");
 
     if (snat_ip && validate_snap_ip_address(snat_ip)) {
diff --git a/northd/lb.h b/northd/lb.h
index 43a8a1850..53dc4abf0 100644
--- a/northd/lb.h
+++ b/northd/lb.h
@@ -75,6 +75,7 @@ struct ovn_northd_lb {
     bool health_checks;
 
     char *hairpin_snat_ip;
+    bool use_stateless_nat;
 };
 
 /* ovn-northd specific backend information. */
diff --git a/northd/northd.c b/northd/northd.c
index 3b1d3eba7..7f157e1c8 100644
--- a/northd/northd.c
+++ b/northd/northd.c
@@ -157,6 +157,7 @@ static bool vxlan_mode;
 #define REG_LB_PORT "reg2[0..15]"
 #define REG_CT_TP_DST "reg1[0..15]"
 #define REG_CT_PROTO "reg1[16..23]"
+#define REG_IDX_LB_STATELESS "reg1[0..15]"
 
 /* Registers for ACL evaluation */
 #define REGBIT_ACL_VERDICT_ALLOW "reg8[16]"
@@ -12381,6 +12382,159 @@ lrouter_use_common_zone(const struct ovn_datapath *od)
     return !od->is_gw_router && use_common_zone;
 }
 
+static void
+build_lrouter_flows_for_lb_stateless(struct lrouter_nat_lb_flows_ctx *ctx,
+                                     struct ovn_datapath *od,
+                                     struct lflow_ref *lflow_ref,
+                                     struct ovn_port *dgp,
+                                     const char *meter)
+{
+    /* (NOTE) dnat_action: Add a new rule lr_in_dnat with backend IP
+     * and port action to skip conntrack completely. It is based on
+     * REG_IDX_LB_STATELESS which was calculated in lr_in_ct_extract.
+     * So, if the packet has VIP IP destination and port
+     * (if port was configured), it selecs a backend based on
+     * REG_IDX_LB_STATELESS. It works to multi-chassis and avoid to
+     * sync conntrack betweem them.
+     */
+    struct ds new_action_stateless_nat = DS_EMPTY_INITIALIZER;
+    struct ds new_match_stateless_nat = DS_EMPTY_INITIALIZER;
+    if (!vector_is_empty(&ctx->lb_vip->backends) ||
+        !ctx->lb_vip->empty_backend_rej) {
+        ds_put_format(&new_match_stateless_nat, "is_chassis_resident(%s)",
+                      dgp->cr_port->json_key);
+    }
+
+    bool ipv4 = ctx->lb_vip->address_family == AF_INET;
+    const char *ip_match = ipv4 ? "ip4" : "ip6";
+    ds_put_format(&new_match_stateless_nat, " && %s && %s.dst == %s",
+                   ip_match, ip_match, ctx->lb_vip->vip_str);
+    if (ctx->lb_vip->port_str) {
+        ds_put_format(&new_match_stateless_nat,
+                      " && %s && %s.dst == %s",
+                      ctx->lb->proto, ctx->lb->proto,
+                      ctx->lb_vip->port_str);
+    }
+
+    const struct ovn_lb_backend *backend;
+    if (vector_len(&ctx->lb_vip->backends) == 1) {
+        backend = vector_get_ptr(&ctx->lb_vip->backends, 0);
+        ds_put_format(&new_action_stateless_nat, "%s.dst = %s; ",
+                      ip_match, backend->ip_str);
+        if (ctx->lb_vip->port_str) {
+            ds_put_format(&new_action_stateless_nat, "%s.dst = %s; ",
+                          ctx->lb->proto, backend->port_str);
+        }
+        ds_put_format(&new_action_stateless_nat, "next;");
+        ovn_lflow_add_with_hint__(ctx->lflows, od, S_ROUTER_IN_DNAT,
+                                  ctx->prio,
+                                  ds_cstr(&new_match_stateless_nat),
+                                  ds_cstr(&new_action_stateless_nat),
+                                  NULL, meter, &ctx->lb->nlb->header_,
+                                  lflow_ref);
+    }
+    size_t match_len = new_match_stateless_nat.length;
+    size_t i = 0;
+    VECTOR_FOR_EACH_PTR (&ctx->lb_vip->backends, backend) {
+        if (vector_len(&ctx->lb_vip->backends) <= 1) {
+            break;
+        }
+        ds_put_format(&new_match_stateless_nat, " && "
+            REG_IDX_LB_STATELESS" == ""%"PRIuSIZE, i++);
+        ds_put_format(&new_action_stateless_nat, "%s.dst = %s; ",
+                      ip_match, backend->ip_str);
+        if (ctx->lb_vip->port_str) {
+            ds_put_format(&new_action_stateless_nat, "%s.dst = %s; ",
+                          ctx->lb->proto, backend->port_str);
+        }
+        ds_put_format(&new_action_stateless_nat, "next;");
+        ovn_lflow_add_with_hint__(ctx->lflows, od, S_ROUTER_IN_DNAT,
+                                  ctx->prio,
+                                  ds_cstr(&new_match_stateless_nat),
+                                  ds_cstr(&new_action_stateless_nat),
+                                  NULL, meter, &ctx->lb->nlb->header_,
+                                  lflow_ref);
+        ds_clear(&new_action_stateless_nat);
+        ds_truncate(&new_match_stateless_nat, match_len);
+    }
+
+
+    if (vector_is_empty(&ctx->lb_vip->backends)) {
+        return;
+    }
+
+    size_t undnat_match_len = ctx->undnat_match->length;
+    struct ds undnat_action = DS_EMPTY_INITIALIZER;
+    struct ds snat_action = DS_EMPTY_INITIALIZER;
+
+
+    /* undnat_action: Just follows the pipeline in the lr_out_undenat NAT rule.
+     */
+    ds_put_format(&undnat_action, "next;");
+
+    /* We need to centralize the LB traffic to properly perform
+     * the undnat stage.
+     */
+    ds_put_format(ctx->undnat_match, ") && outport == %s", dgp->json_key);
+    ds_clear(ctx->gw_redir_action);
+    ds_put_format(ctx->gw_redir_action, "outport = %s; next;",
+                  dgp->cr_port->json_key);
+
+    ovn_lflow_add_with_hint(ctx->lflows, od, S_ROUTER_IN_GW_REDIRECT,
+                            200, ds_cstr(ctx->undnat_match),
+                            ds_cstr(ctx->gw_redir_action),
+                            &ctx->lb->nlb->header_,
+                            lflow_ref);
+    ds_truncate(ctx->undnat_match, undnat_match_len);
+
+    ds_put_format(ctx->undnat_match, ") && (inport == %s || outport == %s)"
+                  " && is_chassis_resident(%s)", dgp->json_key, dgp->json_key,
+                  dgp->cr_port->json_key);
+
+    /* Use the LB protocol as matching criteria for out undnat and snat when
+     * creating LBs with stateless NAT. */
+    ds_put_format(ctx->undnat_match, " && %s", ctx->lb->proto);
+
+    ovn_lflow_add_with_hint(ctx->lflows, od, S_ROUTER_OUT_UNDNAT, 120,
+                            ds_cstr(ctx->undnat_match),
+                            ds_cstr(&undnat_action), &ctx->lb->nlb->header_,
+                            lflow_ref);
+
+    /* (NOTE) snat_action: Add a new rule lr_out_snat with LB VIP as source
+     * IP action to perform stateless NAT pipeline completely when the
+     * outgoing packet is redirected to a chassis that does not have an
+     * active conntrack entry. Otherwise, it will not be SNATed by the
+     * ct_lb action because it does not refer to a valid created flow. The
+     * use case for responding to a packet in different chassis is multipath
+     * via ECMP. So, the LB lr_out_snat is created with a lower priority than
+     * the other router pipeline entries, in this case, if the packet is not
+     * SNATed by ct_lb (conntrack lost), it will be SNATed by the LB
+     * stateless NAT rule. Also, SNAT is performed only when the packet
+     * matches the configured LB backend IPs, ports and protocols. Otherwise,
+     * the packet will be forwarded without SNAted interference.
+     */
+    if (ctx->lb_vip->port_str) {
+        ds_put_format(&snat_action, "%s.src = %s; %s.src = %s; next;",
+                      ctx->lb_vip->address_family == AF_INET6 ?
+                      "ip6" : "ip4",
+                      ctx->lb_vip->vip_str, ctx->lb->proto,
+                      ctx->lb_vip->port_str);
+    } else {
+        ds_put_format(&snat_action, "%s.src = %s; next;",
+                      ctx->lb_vip->address_family == AF_INET6 ?
+                      "ip6" : "ip4",
+                      ctx->lb_vip->vip_str);
+    }
+    ovn_lflow_add_with_hint(ctx->lflows, od, S_ROUTER_OUT_SNAT, 160,
+                            ds_cstr(ctx->undnat_match),
+                            ds_cstr(&snat_action), &ctx->lb->nlb->header_,
+                            lflow_ref);
+
+    ds_truncate(ctx->undnat_match, undnat_match_len);
+    ds_destroy(&undnat_action);
+    ds_destroy(&snat_action);
+}
+
 static void
 build_distr_lrouter_nat_flows_for_lb(struct lrouter_nat_lb_flows_ctx *ctx,
                                      enum lrouter_nat_lb_flow_type type,
@@ -12389,60 +12543,34 @@ build_distr_lrouter_nat_flows_for_lb(struct 
lrouter_nat_lb_flows_ctx *ctx,
                                      struct ovn_port *dgp,
                                      bool stateless_nat)
 {
-    struct ds dnat_action = DS_EMPTY_INITIALIZER;
-
     /* Store the match lengths, so we can reuse the ds buffer. */
     size_t new_match_len = ctx->new_match->length;
     size_t undnat_match_len = ctx->undnat_match->length;
 
-    /* (NOTE) dnat_action: Add the first LB backend IP as a destination
-     * action of the lr_in_dnat NAT rule. Including the backend IP is useful
-     * for accepting packets coming from a chassis that does not have
-     * previously established conntrack entries. This means that the actions
-     * (ip4.dst + ct_lb_mark) are executed in addition and ip4.dst is not
-     * useful when traffic passes through the same chassis for ingress/egress
-     * packets. However, the actions are complementary in cases where traffic
-     * enters from one chassis, the ack response comes from another chassis,
-     * and the final ack step of the TCP handshake comes from the first
-     * chassis used. Without using stateless NAT, the connection will not be
-     * established because the return packet followed a path through another
-     * chassis and only ct_lb_mark will not be able to receive the ack and
-     * forward it to the right backend. With using stateless NAT, the packet
-     * will be accepted and forwarded to the same backend that corresponds to
-     * the previous conntrack entry that is in the SYN_SENT state
-     * (created by ct_lb_mark for the first rcv packet in this flow).
-     */
-    if (stateless_nat) {
-        if (!vector_is_empty(&ctx->lb_vip->backends)) {
-            const struct ovn_lb_backend *backend =
-                vector_get_ptr(&ctx->lb_vip->backends, 0);
-            bool ipv6 = !IN6_IS_ADDR_V4MAPPED(&backend->ip);
-            ds_put_format(&dnat_action, "%s.dst = %s; ", ipv6 ? "ip6" : "ip4",
-                          backend->ip_str);
-        }
-    }
-    ds_put_format(&dnat_action, "%s", ctx->new_action[type]);
-
     const char *meter = NULL;
 
     if (ctx->reject) {
         meter = copp_meter_get(COPP_REJECT, od->nbr->copp, ctx->meter_groups);
     }
 
+    if (stateless_nat) {
+        return build_lrouter_flows_for_lb_stateless(ctx, od, lflow_ref,
+            dgp, meter);
+    }
+
     if (!vector_is_empty(&ctx->lb_vip->backends) ||
         !ctx->lb_vip->empty_backend_rej) {
         ds_put_format(ctx->new_match, " && is_chassis_resident(%s)",
                       dgp->cr_port->json_key);
     }
 
-    ovn_lflow_add_with_hint__(ctx->lflows, od, S_ROUTER_IN_DNAT, ctx->prio,
-                              ds_cstr(ctx->new_match), ds_cstr(&dnat_action),
-                              NULL, meter, &ctx->lb->nlb->header_,
-                              lflow_ref);
+    ovn_lflow_add_with_hint__(ctx->lflows, od, S_ROUTER_IN_DNAT,
+                              ctx->prio, ds_cstr(ctx->new_match),
+                              ctx->new_action[type], NULL, meter,
+                              &ctx->lb->nlb->header_, lflow_ref);
 
     ds_truncate(ctx->new_match, new_match_len);
 
-    ds_destroy(&dnat_action);
     if (vector_is_empty(&ctx->lb_vip->backends)) {
         return;
     }
@@ -12465,13 +12593,6 @@ build_distr_lrouter_nat_flows_for_lb(struct 
lrouter_nat_lb_flows_ctx *ctx,
         break;
     }
 
-    /* undnat_action: Remove the ct action from the lr_out_undenat NAT rule.
-     */
-    if (stateless_nat) {
-        ds_clear(&undnat_action);
-        ds_put_format(&undnat_action, "next;");
-    }
-
     /* We need to centralize the LB traffic to properly perform
      * the undnat stage.
      */
@@ -12490,48 +12611,11 @@ build_distr_lrouter_nat_flows_for_lb(struct 
lrouter_nat_lb_flows_ctx *ctx,
     ds_put_format(ctx->undnat_match, ") && (inport == %s || outport == %s)"
                   " && is_chassis_resident(%s)", dgp->json_key, dgp->json_key,
                   dgp->cr_port->json_key);
-    /* Use the LB protocol as matching criteria for out undnat and snat when
-     * creating LBs with stateless NAT. */
-    if (stateless_nat) {
-        ds_put_format(ctx->undnat_match, " && %s", ctx->lb->proto);
-    }
     ovn_lflow_add_with_hint(ctx->lflows, od, S_ROUTER_OUT_UNDNAT, 120,
                             ds_cstr(ctx->undnat_match),
                             ds_cstr(&undnat_action), &ctx->lb->nlb->header_,
                             lflow_ref);
 
-    /* (NOTE) snat_action: Add a new rule lr_out_snat with LB VIP as source
-     * IP action to perform stateless NAT pipeline completely when the
-     * outgoing packet is redirected to a chassis that does not have an
-     * active conntrack entry. Otherwise, it will not be SNATed by the
-     * ct_lb action because it does not refer to a valid created flow. The
-     * use case for responding to a packet in different chassis is multipath
-     * via ECMP. So, the LB lr_out_snat is created with a lower priority than
-     * the other router pipeline entries, in this case, if the packet is not
-     * SNATed by ct_lb (conntrack lost), it will be SNATed by the LB
-     * stateless NAT rule. Also, SNAT is performed only when the packet
-     * matches the configured LB backend IPs, ports and protocols. Otherwise,
-     * the packet will be forwarded without SNAted interference.
-     */
-    if (stateless_nat) {
-        if (ctx->lb_vip->port_str) {
-            ds_put_format(&snat_action, "%s.src = %s; %s.src = %s; next;",
-                          ctx->lb_vip->address_family == AF_INET6 ?
-                          "ip6" : "ip4",
-                          ctx->lb_vip->vip_str, ctx->lb->proto,
-                          ctx->lb_vip->port_str);
-        } else {
-            ds_put_format(&snat_action, "%s.src = %s; next;",
-                          ctx->lb_vip->address_family == AF_INET6 ?
-                          "ip6" : "ip4",
-                          ctx->lb_vip->vip_str);
-        }
-        ovn_lflow_add_with_hint(ctx->lflows, od, S_ROUTER_OUT_SNAT, 160,
-                                ds_cstr(ctx->undnat_match),
-                                ds_cstr(&snat_action), &ctx->lb->nlb->header_,
-                                lflow_ref);
-    }
-
     ds_truncate(ctx->undnat_match, undnat_match_len);
     ds_destroy(&undnat_action);
     ds_destroy(&snat_action);
@@ -12691,8 +12775,7 @@ build_lrouter_nat_flows_for_lb(
      * lflow generation for them.
      */
     size_t index;
-    bool use_stateless_nat = smap_get_bool(&lb->nlb->options,
-                                           "use_stateless_nat", false);
+    bool use_stateless_nat = lb->use_stateless_nat;
     DYNAMIC_BITMAP_FOR_EACH_1 (index, &lb_dps->nb_lr_map) {
         struct ovn_datapath *od = vector_get(&lr_datapaths->dps, index,
                                              struct ovn_datapath *);
@@ -12841,21 +12924,48 @@ build_lrouter_defrag_flows_for_lb(struct 
ovn_lb_datapaths *lb_dps,
     if (dynamic_bitmap_is_empty(&lb_dps->nb_lr_map)) {
         return;
     }
+    struct ds action = DS_EMPTY_INITIALIZER;
 
     for (size_t i = 0; i < lb_dps->lb->n_vips; i++) {
         struct ovn_lb_vip *lb_vip = &lb_dps->lb->vips[i];
         bool ipv6 = lb_vip->address_family == AF_INET6;
         int prio = 100;
-
+        enum ovn_stage stage = S_ROUTER_IN_DEFRAG;
         ds_clear(match);
         ds_put_format(match, "ip && ip%c.dst == %s", ipv6 ? '6' : '4',
                       lb_vip->vip_str);
-
+        if (lb_dps->lb->use_stateless_nat) {
+            stage = S_ROUTER_IN_CT_EXTRACT;
+            prio = 120;
+            if (vector_len(&lb_vip->backends) > 1) {
+                ds_put_format(&action, REG_IDX_LB_STATELESS" = select(");
+                if (lb_dps->lb->selection_fields) {
+                    ds_put_format(&action, "values=(");
+                }
+                for (size_t idx_backend = 0; idx_backend <
+                     vector_len(&lb_vip->backends);
+                     idx_backend++) {
+                    ds_put_format(&action, "%"PRIuSIZE",", idx_backend);
+                }
+                ds_truncate(&action, action.length - 1);
+                if (lb_dps->lb->selection_fields) {
+                    ds_put_format(&action, "); hash_fields=\"%s\"",
+                                  lb_dps->lb->selection_fields);
+                }
+                ds_put_format(&action,");");
+            } else {
+                ds_put_format(&action, "next;");
+            }
+        } else {
+            ds_put_format(&action, "ct_dnat;");
+        }
         ovn_lflow_add_with_dp_group(
             lflows, lb_dps->nb_lr_map.map, ods_size(lr_datapaths),
-            S_ROUTER_IN_DEFRAG, prio, ds_cstr(match), "ct_dnat;",
+            stage, prio, ds_cstr(match), ds_cstr(&action),
             &lb_dps->lb->nlb->header_, lb_dps->lflow_ref);
+        ds_clear(&action);
     }
+    ds_destroy(&action);
 }
 
 static void
diff --git a/tests/multinode.at b/tests/multinode.at
index a2c8e3f55..c4ec71481 100644
--- a/tests/multinode.at
+++ b/tests/multinode.at
@@ -1643,6 +1643,7 @@ check multinode_nbctl ls-lb-add sw0 lb0
 
 # Set use_stateless_nat to true
 check multinode_nbctl set load_balancer lb0 options:use_stateless_nat=true
+check multinode_nbctl set load_balancer lb0 
selection_fields="ip_src,tp_src,ip_dst,tp_dst"
 
 # Start backend http services
 M_NS_DAEMONIZE([ovn-chassis-1], [sw0p1], [python3 -m http.server --bind 
10.0.1.3 80 >/dev/null 2>&1], [http1.pid])
@@ -1674,14 +1675,12 @@ m_as ovn-gw-2 ovs-appctl dpctl/flush-conntrack
 M_NS_EXEC([ovn-chassis-3], [publicp1], [sh -c 'curl -v 172.16.0.100:80 --retry 
0 --connect-timeout 1 --max-time 1 --local-port 59001'])
 OVS_WAIT_FOR_OUTPUT([m_as ovn-gw-1 ovs-appctl dpctl/dump-conntrack | 
M_FORMAT_CT(20.0.1.3) | \
 grep tcp | sed -E -e 's/10.0.1.3|10.0.1.4/<cleared>/g' | sort], [0], [dnl
-tcp,orig=(src=20.0.1.3,dst=<cleared>,sport=59001,dport=80),reply=(src=<cleared>,dst=20.0.1.3,sport=80,dport=59001),zone=<cleared>,mark=<cleared>,protoinfo=(state=<cleared>)
 
tcp,orig=(src=20.0.1.3,dst=<cleared>,sport=59001,dport=80),reply=(src=<cleared>,dst=20.0.1.3,sport=80,dport=59001),zone=<cleared>,protoinfo=(state=<cleared>)
 ])
 
 M_NS_EXEC([ovn-chassis-4], [publicp2], [sh -c 'curl -v 172.16.0.100:80 --retry 
0 --connect-timeout 1 --max-time 1 --local-port 59000'])
 OVS_WAIT_FOR_OUTPUT([m_as ovn-gw-2 ovs-appctl dpctl/dump-conntrack | 
M_FORMAT_CT(30.0.1.3) | \
 grep tcp | sed -E -e 's/10.0.1.3|10.0.1.4/<cleared>/g' | sort], [0], [dnl
-tcp,orig=(src=30.0.1.3,dst=<cleared>,sport=59000,dport=80),reply=(src=<cleared>,dst=30.0.1.3,sport=80,dport=59000),zone=<cleared>,mark=<cleared>,protoinfo=(state=<cleared>)
 
tcp,orig=(src=30.0.1.3,dst=<cleared>,sport=59000,dport=80),reply=(src=<cleared>,dst=30.0.1.3,sport=80,dport=59000),zone=<cleared>,protoinfo=(state=<cleared>)
 ])
 
@@ -1712,7 +1711,6 @@ Connected to 172.16.0.100 (172.16.0.100) port 80
 # Check if we have only one backend for the same connection - orig + dest ports
 OVS_WAIT_FOR_OUTPUT([echo -e $gw1_ct | M_FORMAT_CT(20.0.1.3) | \
 grep tcp | sed -E -e 's/10.0.1.3|10.0.1.4/<cleared>/g' | sort], [0], [dnl
-tcp,orig=(src=20.0.1.3,dst=<cleared>,sport=59004,dport=80),reply=(src=<cleared>,dst=20.0.1.3,sport=80,dport=59004),zone=<cleared>,mark=<cleared>,protoinfo=(state=<cleared>)
 
tcp,orig=(src=20.0.1.3,dst=<cleared>,sport=59004,dport=80),reply=(src=<cleared>,dst=20.0.1.3,sport=80,dport=59004),zone=<cleared>,protoinfo=(state=<cleared>)
 ])
 
@@ -1778,7 +1776,6 @@ Connected to 172.16.0.100 (172.16.0.100) port 80
 # Check if we have only one backend for the same connection - orig + dest ports
 OVS_WAIT_FOR_OUTPUT([echo -e $gw1_ct | M_FORMAT_CT(20.0.1.3) | \
 grep tcp | sed -E -e 's/10.0.1.3|10.0.1.4/<cleared>/g' | sort], [0], [dnl
-tcp,orig=(src=20.0.1.3,dst=<cleared>,sport=59005,dport=80),reply=(src=<cleared>,dst=20.0.1.3,sport=80,dport=59005),zone=<cleared>,mark=<cleared>,protoinfo=(state=<cleared>)
 
tcp,orig=(src=20.0.1.3,dst=<cleared>,sport=59005,dport=80),reply=(src=<cleared>,dst=20.0.1.3,sport=80,dport=59005),zone=<cleared>,protoinfo=(state=<cleared>)
 ])
 
@@ -1834,7 +1831,6 @@ Connected to 172.16.0.100 (172.16.0.100) port 80
 # Check if we have only one backend for the same connection - orig + dest ports
 OVS_WAIT_FOR_OUTPUT([echo -e $gw2_ct | M_FORMAT_CT(30.0.1.3) | \
 grep tcp | sed -E -e 's/10.0.1.3|10.0.1.4/<cleared>/g' | sort], [0], [dnl
-tcp,orig=(src=30.0.1.3,dst=<cleared>,sport=59006,dport=80),reply=(src=<cleared>,dst=30.0.1.3,sport=80,dport=59006),zone=<cleared>,mark=<cleared>,protoinfo=(state=<cleared>)
 
tcp,orig=(src=30.0.1.3,dst=<cleared>,sport=59006,dport=80),reply=(src=<cleared>,dst=30.0.1.3,sport=80,dport=59006),zone=<cleared>,protoinfo=(state=<cleared>)
 ])
 
@@ -1900,7 +1896,6 @@ Connected to 172.16.0.100 (172.16.0.100) port 80
 # Check if we have only one backend for the same connection - orig + dest ports
 OVS_WAIT_FOR_OUTPUT([echo -e $gw2_ct | M_FORMAT_CT(30.0.1.3) | \
 grep tcp | sed -E -e 's/10.0.1.3|10.0.1.4/<cleared>/g' | sort], [0], [dnl
-tcp,orig=(src=30.0.1.3,dst=<cleared>,sport=59007,dport=80),reply=(src=<cleared>,dst=30.0.1.3,sport=80,dport=59007),zone=<cleared>,mark=<cleared>,protoinfo=(state=<cleared>)
 
tcp,orig=(src=30.0.1.3,dst=<cleared>,sport=59007,dport=80),reply=(src=<cleared>,dst=30.0.1.3,sport=80,dport=59007),zone=<cleared>,protoinfo=(state=<cleared>)
 ])
 
@@ -1987,7 +1982,6 @@ M_NS_EXEC([ovn-chassis-3], [publicp1], [sh -c 'curl -v -O 
172.16.0.100:9000/down
 OVS_WAIT_FOR_OUTPUT([m_as ovn-gw-1 ovs-appctl dpctl/dump-conntrack | 
M_FORMAT_CT(20.0.1.3) | \
 grep tcp | sed -E -e 's/10.0.1.3|10.0.1.4/<cleared>/g' | sort], [0], [dnl
 
tcp,orig=(src=20.0.1.3,dst=<cleared>,sport=59008,dport=80),reply=(src=<cleared>,dst=20.0.1.3,sport=80,dport=59008),zone=<cleared>,protoinfo=(state=<cleared>)
-tcp,orig=(src=20.0.1.3,dst=<cleared>,sport=59008,dport=9000),reply=(src=<cleared>,dst=20.0.1.3,sport=80,dport=59008),zone=<cleared>,mark=<cleared>,protoinfo=(state=<cleared>)
 ])
 
 OVS_WAIT_FOR_OUTPUT([m_as ovn-chassis-3 cat -v curl.out | 
M_FORMAT_CURL([172.16.0.100], [9000])], [0], [dnl
@@ -2003,7 +1997,6 @@ M_NS_EXEC([ovn-chassis-4], [publicp2], [sh -c 'curl -v -O 
172.16.0.100:9000/down
 OVS_WAIT_FOR_OUTPUT([m_as ovn-gw-2 ovs-appctl dpctl/dump-conntrack | 
M_FORMAT_CT(30.0.1.3) | \
 grep tcp | sed -E -e 's/10.0.1.3|10.0.1.4/<cleared>/g' | sort], [0], [dnl
 
tcp,orig=(src=30.0.1.3,dst=<cleared>,sport=59008,dport=80),reply=(src=<cleared>,dst=30.0.1.3,sport=80,dport=59008),zone=<cleared>,protoinfo=(state=<cleared>)
-tcp,orig=(src=30.0.1.3,dst=<cleared>,sport=59008,dport=9000),reply=(src=<cleared>,dst=30.0.1.3,sport=80,dport=59008),zone=<cleared>,mark=<cleared>,protoinfo=(state=<cleared>)
 ])
 
 OVS_WAIT_FOR_OUTPUT([m_as ovn-chassis-3 cat -v curl.out | 
M_FORMAT_CURL([172.16.0.100], [9000])], [0], [dnl
@@ -2036,14 +2029,14 @@ done
 #                                                   |
 #                     
+.............................|.............................+
 #                     |                                                        
   |
-#      DGP publicp3 (ovn-gw-3) (20.0.2.3/24)                     DGP publicp4 
(ovn-gw-4) (20.0.2.4/24)
+#      DGP publicp3 (ovn-gw-3) (20.0.1.2/24)                     DGP publicp4 
(ovn-gw-4) (20.0.2.4/24)
 #                     |                                                        
   |
 #                     
+.............................+.............................+
-#                                                   |
-#                                                   | (overlay)
+#                     |                                                        
   |
+#                     | (public_right)                               
(public_left)|
 #                     
+.............................+.............................+
 #                     |                                                        
   |
-#      DGP public1 (ovn-gw-1) (20.0.2.1/24)                      DGP public2 
(ovn-gw-2) (20.0.2.2/24)
+#      DGP public1 (ovn-gw-1) (20.0.1.1/24)                      DGP public2 
(ovn-gw-2) (20.0.2.2/24)
 #                     |                                                        
   |
 #                     
+.............................+.............................+
 #                                                   |
@@ -2100,17 +2093,18 @@ check multinode_nbctl lsp-set-addresses sw0-lr0 router
 check multinode_nbctl lsp-set-options sw0-lr0 router-port=lr0-sw0
 
 # create external connection for N/S traffic using multiple DGPs
-check multinode_nbctl ls-add public
+check multinode_nbctl ls-add public_right
+check multinode_nbctl ls-add public_left
 
 # create external connection for N/S traffic
 # DGP public1
-check multinode_nbctl lsp-add public ln-public-1
+check multinode_nbctl lsp-add public_right ln-public-1
 check multinode_nbctl lsp-set-type ln-public-1 localnet
 check multinode_nbctl lsp-set-addresses ln-public-1 unknown
 check multinode_nbctl lsp-set-options ln-public-1 network_name=public1
 
 # DGP public2
-check multinode_nbctl lsp-add public ln-public-2
+check multinode_nbctl lsp-add public_left ln-public-2
 check multinode_nbctl lsp-set-type ln-public-2 localnet
 check multinode_nbctl lsp-set-addresses ln-public-2 unknown
 check multinode_nbctl lsp-set-options ln-public-2 network_name=public2
@@ -2121,8 +2115,8 @@ m_as ovn-gw-1 ovs-vsctl set open . 
external-ids:ovn-bridge-mappings=public1:br-e
 # Attach DGP public2 to GW-2 public2 (overlay connectivity)
 m_as ovn-gw-2 ovs-vsctl set open . 
external-ids:ovn-bridge-mappings=public2:br-ex
 
-check multinode_nbctl lrp-add lr0 lr0-public-p1 40:54:00:00:00:01 20.0.2.1/24 
2000::1/64
-check multinode_nbctl lsp-add public public-lr0-p1
+check multinode_nbctl lrp-add lr0 lr0-public-p1 40:54:00:00:00:01 20.0.1.1/24 
2000::1/64
+check multinode_nbctl lsp-add public_right public-lr0-p1
 check multinode_nbctl lsp-set-type public-lr0-p1 router
 check multinode_nbctl lsp-set-addresses public-lr0-p1 router
 check multinode_nbctl lsp-set-options public-lr0-p1 router-port=lr0-public-p1
@@ -2130,13 +2124,13 @@ check multinode_nbctl lrp-set-gateway-chassis 
lr0-public-p1 ovn-gw-1 10
 
 m_wait_for_ports_up
 
-M_NS_CHECK_EXEC([ovn-chassis-1], [sw0p1], [ping -q -c 3 -i 0.3 -w 2 20.0.2.1 | 
FORMAT_PING], \
+M_NS_CHECK_EXEC([ovn-chassis-1], [sw0p1], [ping -q -c 3 -i 0.3 -w 2 20.0.1.1 | 
FORMAT_PING], \
 [0], [dnl
 3 packets transmitted, 3 received, 0% packet loss, time 0ms
 ])
 
 check multinode_nbctl lrp-add lr0 lr0-public-p2 40:54:00:00:00:02 20.0.2.2/24 
2000::2/64
-check multinode_nbctl lsp-add public public-lr0-p2
+check multinode_nbctl lsp-add public_left public-lr0-p2
 check multinode_nbctl lsp-set-type public-lr0-p2 router
 check multinode_nbctl lsp-set-addresses public-lr0-p2 router
 check multinode_nbctl lsp-set-options public-lr0-p2 router-port=lr0-public-p2
@@ -2157,7 +2151,7 @@ check multinode_nbctl lsp-set-options sw1-lr1 
router-port=lr1-sw1
 
 # create external connection for N/S traffic
 # DGP public3
-check multinode_nbctl lsp-add public ln-public-3
+check multinode_nbctl lsp-add public_right ln-public-3
 check multinode_nbctl lsp-set-type ln-public-3 localnet
 check multinode_nbctl lsp-set-addresses ln-public-3 unknown
 check multinode_nbctl lsp-set-options ln-public-3 network_name=public3
@@ -2165,8 +2159,8 @@ check multinode_nbctl lsp-set-options ln-public-3 
network_name=public3
 # Attach DGP public3 to GW-3 public3 (overlay connectivity)
 m_as ovn-gw-3 ovs-vsctl set open . 
external-ids:ovn-bridge-mappings=public3:br-ex
 
-check multinode_nbctl lrp-add lr1 lr1-public-p3 40:54:00:00:00:03 20.0.2.3/24 
2000::3/64
-check multinode_nbctl lsp-add public public-lr1-p3
+check multinode_nbctl lrp-add lr1 lr1-public-p3 40:54:00:00:00:03 20.0.1.2/24 
2000::3/64
+check multinode_nbctl lsp-add public_right public-lr1-p3
 check multinode_nbctl lsp-set-type public-lr1-p3 router
 check multinode_nbctl lsp-set-addresses public-lr1-p3 router
 check multinode_nbctl lsp-set-options public-lr1-p3 router-port=lr1-public-p3
@@ -2177,21 +2171,16 @@ M_NS_CHECK_EXEC([ovn-chassis-3], [sw1p1], [ping -q -c 3 
-i 0.3 -w 2 40.0.2.1 | F
 3 packets transmitted, 3 received, 0% packet loss, time 0ms
 ])
 
-M_NS_CHECK_EXEC([ovn-chassis-3], [sw1p1], [ping -q -c 3 -i 0.3 -w 2 20.0.2.3 | 
FORMAT_PING], \
+M_NS_CHECK_EXEC([ovn-chassis-3], [sw1p1], [ping -q -c 3 -i 0.3 -w 2 20.0.1.2 | 
FORMAT_PING], \
 [0], [dnl
 3 packets transmitted, 3 received, 0% packet loss, time 0ms
 ])
 
 # Add a default route for multiple DGPs using ECMP - first step
-check multinode_nbctl --ecmp lr-route-add lr0 0.0.0.0/0 20.0.2.3
-check multinode_nbctl --ecmp lr-route-add lr1 0.0.0.0/0 20.0.2.1
-
-# Add SNAT rules using gateway-port
-check multinode_nbctl --gateway-port lr0-public-p1 lr-nat-add lr0 snat 
20.0.2.1 10.0.2.0/24
-check multinode_nbctl --gateway-port lr0-public-p2 lr-nat-add lr0 snat 
20.0.2.2 10.0.2.0/24
-check multinode_nbctl --gateway-port lr1-public-p3 lr-nat-add lr1 snat 
20.0.2.3 40.0.2.0/24
+check multinode_nbctl --ecmp lr-route-add lr0 0.0.0.0/0 20.0.1.2
+check multinode_nbctl --ecmp lr-route-add lr1 0.0.0.0/0 20.0.1.1
 
-M_NS_CHECK_EXEC([ovn-chassis-3], [sw1p1], [ping -q -c 3 -i 0.3 -w 2 20.0.2.1 | 
FORMAT_PING], \
+M_NS_CHECK_EXEC([ovn-chassis-3], [sw1p1], [ping -q -c 3 -i 0.3 -w 2 20.0.1.1 | 
FORMAT_PING], \
 [0], [dnl
 3 packets transmitted, 3 received, 0% packet loss, time 0ms
 ])
@@ -2203,7 +2192,7 @@ M_NS_CHECK_EXEC([ovn-chassis-3], [sw1p1], [ping -q -c 3 
-i 0.3 -w 2 20.0.2.2 | F
 
 # Configure the second DGP for the lr1
 # DGP public4
-check multinode_nbctl lsp-add public ln-public-4
+check multinode_nbctl lsp-add public_left ln-public-4
 check multinode_nbctl lsp-set-type ln-public-4 localnet
 check multinode_nbctl lsp-set-addresses ln-public-4 unknown
 check multinode_nbctl lsp-set-options ln-public-4 network_name=public4
@@ -2212,7 +2201,7 @@ check multinode_nbctl lsp-set-options ln-public-4 
network_name=public4
 m_as ovn-gw-4 ovs-vsctl set open . 
external-ids:ovn-bridge-mappings=public4:br-ex
 
 check multinode_nbctl lrp-add lr1 lr1-public-p4 40:54:00:00:00:04 20.0.2.4/24 
2000::4/64
-check multinode_nbctl lsp-add public public-lr1-p4
+check multinode_nbctl lsp-add public_left public-lr1-p4
 check multinode_nbctl lsp-set-type public-lr1-p4 router
 check multinode_nbctl lsp-set-addresses public-lr1-p4 router
 check multinode_nbctl lsp-set-options public-lr1-p4 router-port=lr1-public-p4
@@ -2223,9 +2212,6 @@ M_NS_CHECK_EXEC([ovn-chassis-3], [sw1p1], [ping -q -c 3 
-i 0.3 -w 2 20.0.2.4 | F
 3 packets transmitted, 3 received, 0% packet loss, time 0ms
 ])
 
-# Add SNAT rules using gateway-port
-check multinode_nbctl --gateway-port lr1-public-p4 lr-nat-add lr1 snat 
20.0.2.4 40.0.2.0/24
-
 # Add a default route for multiple DGPs using ECMP - second step (multipath)
 check multinode_nbctl --ecmp lr-route-add lr0 0.0.0.0/0 20.0.2.4
 check multinode_nbctl --ecmp lr-route-add lr1 0.0.0.0/0 20.0.2.2
@@ -2359,36 +2345,77 @@ fi
 # Set use_stateless_nat to true
 # Now, if the traffic passes through both gateways (GW-1 and GW-2) it will be 
forwarded successfully
 check multinode_nbctl set load_balancer lb0 options:use_stateless_nat=true
+check multinode_nbctl --wait=sb set load_balancer lb0 
selection_fields="ip_src,tp_src,ip_dst,tp_dst"
 
 # Check the flows again for the LB VIP - always needs to be successful 
regardless of the datapath (one or two gw chassis)
 M_NS_EXEC([ovn-chassis-3], [sw1p1], [sh -c 'curl -v -O 
172.16.0.100:80/download_file --retry 0 --connect-timeout 1 --max-time 1 
2>curl.out'])
+M_NS_EXEC([ovn-chassis-1], [sw0p1], [sh -c 'ss -nn >connections.out'])
+M_NS_EXEC([ovn-chassis-2], [sw0p2], [sh -c 'ss -nn >connections.out'])
 
 OVS_WAIT_FOR_OUTPUT([m_as ovn-chassis-3 cat -v curl.out | 
M_FORMAT_CURL([172.16.0.100], [80])], [0], [dnl
 Connected to 172.16.0.100 (172.16.0.100) port 80
 200 OK
 ])
 
+OVS_WAIT_FOR_OUTPUT([m_as ovn-chassis-1 cat connections.out | grep 
"FIN-WAIT-2" | wc -l], [0], [dnl
+0
+])
+
+OVS_WAIT_FOR_OUTPUT([m_as ovn-chassis-2 cat connections.out | grep  
"FIN-WAIT-2" | wc -l], [0], [dnl
+0
+])
+
 M_NS_EXEC([ovn-chassis-3], [sw1p1], [sh -c 'curl -v -O 
172.16.0.100:80/download_file --retry 0 --connect-timeout 1 --max-time 1 
2>curl.out'])
+M_NS_EXEC([ovn-chassis-1], [sw0p1], [sh -c 'ss -nn >connections.out'])
+M_NS_EXEC([ovn-chassis-2], [sw0p2], [sh -c 'ss -nn >connections.out'])
 
 OVS_WAIT_FOR_OUTPUT([m_as ovn-chassis-3 cat -v curl.out | 
M_FORMAT_CURL([172.16.0.100], [80])], [0], [dnl
 Connected to 172.16.0.100 (172.16.0.100) port 80
 200 OK
 ])
 
+OVS_WAIT_FOR_OUTPUT([m_as ovn-chassis-1 cat connections.out | grep 
"FIN-WAIT-2" | wc -l], [0], [dnl
+0
+])
+
+OVS_WAIT_FOR_OUTPUT([m_as ovn-chassis-2 cat connections.out | grep 
"FIN-WAIT-2" | wc -l], [0], [dnl
+0
+])
+
 M_NS_EXEC([ovn-chassis-3], [sw1p1], [sh -c 'curl -v -O 
172.16.0.100:80/download_file --retry 0 --connect-timeout 1 --max-time 1 
2>curl.out'])
+M_NS_EXEC([ovn-chassis-1], [sw0p1], [sh -c 'ss -nn >connections.out'])
+M_NS_EXEC([ovn-chassis-2], [sw0p2], [sh -c 'ss -nn >connections.out'])
 
 OVS_WAIT_FOR_OUTPUT([m_as ovn-chassis-3 cat -v curl.out | 
M_FORMAT_CURL([172.16.0.100], [80])], [0], [dnl
 Connected to 172.16.0.100 (172.16.0.100) port 80
 200 OK
 ])
 
+OVS_WAIT_FOR_OUTPUT([m_as ovn-chassis-1 cat connections.out | grep 
"FIN-WAIT-2" | wc -l], [0], [dnl
+0
+])
+
+OVS_WAIT_FOR_OUTPUT([m_as ovn-chassis-2 cat connections.out | grep 
"FIN-WAIT-2" | wc -l], [0], [dnl
+0
+])
+
 M_NS_EXEC([ovn-chassis-3], [sw1p1], [sh -c 'curl -v -O 
172.16.0.100:80/download_file --retry 0 --connect-timeout 1 --max-time 1 
2>curl.out'])
+M_NS_EXEC([ovn-chassis-1], [sw0p1], [sh -c 'ss -nn >connections.out'])
+M_NS_EXEC([ovn-chassis-2], [sw0p2], [sh -c 'ss -nn >connections.out'])
 
 OVS_WAIT_FOR_OUTPUT([m_as ovn-chassis-3 cat -v curl.out | 
M_FORMAT_CURL([172.16.0.100], [80])], [0], [dnl
 Connected to 172.16.0.100 (172.16.0.100) port 80
 200 OK
 ])
 
+OVS_WAIT_FOR_OUTPUT([m_as ovn-chassis-1 cat connections.out | grep 
"FIN-WAIT-2" | wc -l], [0], [dnl
+0
+])
+
+OVS_WAIT_FOR_OUTPUT([m_as ovn-chassis-2 cat connections.out | grep 
"FIN-WAIT-2" | wc -l], [0], [dnl
+0
+])
+
 # Direct backend traffic using the same LB ports needs to be dropped
 M_NS_EXEC([ovn-chassis-3], [sw1p1], [sh -c 'curl -v -O 
10.0.2.3:80/download_file --retry 0 --connect-timeout 1 --max-time 1 
2>curl.out'])
 
diff --git a/tests/ovn-northd.at b/tests/ovn-northd.at
index 07fb57bd6..c79766aae 100644
--- a/tests/ovn-northd.at
+++ b/tests/ovn-northd.at
@@ -14469,14 +14469,66 @@ ovn-sbctl dump-flows lr1 > lr1flows
 AT_CAPTURE_FILE([lr1flows])
 
 # Check stateless NAT rules for load balancer with multiple DGP
-# 1. Check if the backend IPs are in the ipX.dst action
+# 1. Check if the reg1[0..15] will select one of backends
+AT_CHECK([grep "lr_in_ct_extract" lr1flows | ovn_strip_lflows | grep 
"30.0.0.1"], [0], [dnl
+  table=??(lr_in_ct_extract   ), priority=120  , match=(ip && ip4.dst == 
30.0.0.1), action=(reg1[[0..15]] = select(0,1,2);)
+])
+
+# 2. Check if the backend IPs are in the ipX.dst action
 AT_CHECK([grep "lr_in_dnat" lr1flows | ovn_strip_lflows | grep "30.0.0.1"], 
[0], [dnl
-  table=??(lr_in_dnat         ), priority=110  , match=(ct.new && !ct.rel && 
ip4 && ip4.dst == 30.0.0.1 && is_chassis_resident("cr-lr1-ts1")), 
action=(ip4.dst = 172.16.0.103; 
ct_lb_mark(backends=172.16.0.103,172.16.0.102,172.16.0.101);)
-  table=??(lr_in_dnat         ), priority=110  , match=(ct.new && !ct.rel && 
ip4 && ip4.dst == 30.0.0.1 && is_chassis_resident("cr-lr1-ts2")), 
action=(ip4.dst = 172.16.0.103; 
ct_lb_mark(backends=172.16.0.103,172.16.0.102,172.16.0.101);)
-  table=??(lr_in_dnat         ), priority=110  , match=(ct.new && !ct.rel && 
ip4 && ip4.dst == 30.0.0.1 && is_chassis_resident("cr-lr1_public")), 
action=(ip4.dst = 172.16.0.103; 
ct_lb_mark(backends=172.16.0.103,172.16.0.102,172.16.0.101);)
+  table=??(lr_in_dnat         ), priority=110  , 
match=(is_chassis_resident("cr-lr1-ts1") && ip4 && ip4.dst == 30.0.0.1 && 
reg1[[0..15]] == 0), action=(ip4.dst = 172.16.0.103; next;)
+  table=??(lr_in_dnat         ), priority=110  , 
match=(is_chassis_resident("cr-lr1-ts1") && ip4 && ip4.dst == 30.0.0.1 && 
reg1[[0..15]] == 1), action=(ip4.dst = 172.16.0.102; next;)
+  table=??(lr_in_dnat         ), priority=110  , 
match=(is_chassis_resident("cr-lr1-ts1") && ip4 && ip4.dst == 30.0.0.1 && 
reg1[[0..15]] == 2), action=(ip4.dst = 172.16.0.101; next;)
+  table=??(lr_in_dnat         ), priority=110  , 
match=(is_chassis_resident("cr-lr1-ts2") && ip4 && ip4.dst == 30.0.0.1 && 
reg1[[0..15]] == 0), action=(ip4.dst = 172.16.0.103; next;)
+  table=??(lr_in_dnat         ), priority=110  , 
match=(is_chassis_resident("cr-lr1-ts2") && ip4 && ip4.dst == 30.0.0.1 && 
reg1[[0..15]] == 1), action=(ip4.dst = 172.16.0.102; next;)
+  table=??(lr_in_dnat         ), priority=110  , 
match=(is_chassis_resident("cr-lr1-ts2") && ip4 && ip4.dst == 30.0.0.1 && 
reg1[[0..15]] == 2), action=(ip4.dst = 172.16.0.101; next;)
+  table=??(lr_in_dnat         ), priority=110  , 
match=(is_chassis_resident("cr-lr1_public") && ip4 && ip4.dst == 30.0.0.1 && 
reg1[[0..15]] == 0), action=(ip4.dst = 172.16.0.103; next;)
+  table=??(lr_in_dnat         ), priority=110  , 
match=(is_chassis_resident("cr-lr1_public") && ip4 && ip4.dst == 30.0.0.1 && 
reg1[[0..15]] == 1), action=(ip4.dst = 172.16.0.102; next;)
+  table=??(lr_in_dnat         ), priority=110  , 
match=(is_chassis_resident("cr-lr1_public") && ip4 && ip4.dst == 30.0.0.1 && 
reg1[[0..15]] == 2), action=(ip4.dst = 172.16.0.101; next;)
+])
+
+# 3. Check if the DGP ports are in the match with action next
+AT_CHECK([grep "lr_out_undnat" lr1flows | ovn_strip_lflows], [0], [dnl
+  table=??(lr_out_undnat      ), priority=0    , match=(1), action=(next;)
+  table=??(lr_out_undnat      ), priority=120  , match=(ip4 && ((ip4.src == 
172.16.0.103) || (ip4.src == 172.16.0.102) || (ip4.src == 172.16.0.101)) && 
(inport == "lr1-ts1" || outport == "lr1-ts1") && 
is_chassis_resident("cr-lr1-ts1") && tcp), action=(next;)
+  table=??(lr_out_undnat      ), priority=120  , match=(ip4 && ((ip4.src == 
172.16.0.103) || (ip4.src == 172.16.0.102) || (ip4.src == 172.16.0.101)) && 
(inport == "lr1-ts2" || outport == "lr1-ts2") && 
is_chassis_resident("cr-lr1-ts2") && tcp), action=(next;)
+  table=??(lr_out_undnat      ), priority=120  , match=(ip4 && ((ip4.src == 
172.16.0.103) || (ip4.src == 172.16.0.102) || (ip4.src == 172.16.0.101)) && 
(inport == "lr1_public" || outport == "lr1_public") && 
is_chassis_resident("cr-lr1_public") && tcp), action=(next;)
 ])
 
-# 2. Check if the DGP ports are in the match with action next
+# 4. Check if the VIP IP is in the ipX.src action
+AT_CHECK([grep "lr_out_snat" lr1flows | ovn_strip_lflows], [0], [dnl
+  table=??(lr_out_snat        ), priority=0    , match=(1), action=(next;)
+  table=??(lr_out_snat        ), priority=120  , match=(nd_ns), action=(next;)
+  table=??(lr_out_snat        ), priority=160  , match=(ip4 && ((ip4.src == 
172.16.0.103) || (ip4.src == 172.16.0.102) || (ip4.src == 172.16.0.101)) && 
(inport == "lr1-ts1" || outport == "lr1-ts1") && 
is_chassis_resident("cr-lr1-ts1") && tcp), action=(ip4.src = 30.0.0.1; next;)
+  table=??(lr_out_snat        ), priority=160  , match=(ip4 && ((ip4.src == 
172.16.0.103) || (ip4.src == 172.16.0.102) || (ip4.src == 172.16.0.101)) && 
(inport == "lr1-ts2" || outport == "lr1-ts2") && 
is_chassis_resident("cr-lr1-ts2") && tcp), action=(ip4.src = 30.0.0.1; next;)
+  table=??(lr_out_snat        ), priority=160  , match=(ip4 && ((ip4.src == 
172.16.0.103) || (ip4.src == 172.16.0.102) || (ip4.src == 172.16.0.101)) && 
(inport == "lr1_public" || outport == "lr1_public") && 
is_chassis_resident("cr-lr1_public") && tcp), action=(ip4.src = 30.0.0.1; next;)
+])
+
+# Set selection fields
+check ovn-nbctl --wait=sb set load_balancer lb1 
selection_fields="ip_src,tp_src,ip_dst,tp_dst"
+
+ovn-sbctl dump-flows lr1 > lr1flows
+AT_CAPTURE_FILE([lr1flows])
+
+# 1. Check if the reg1[0..15] will select one of backends using hash_fields
+AT_CHECK([grep "lr_in_ct_extract" lr1flows | ovn_strip_lflows | grep 
"30.0.0.1"], [0], [dnl
+  table=??(lr_in_ct_extract   ), priority=120  , match=(ip && ip4.dst == 
30.0.0.1), action=(reg1[[0..15]] = select(values=(0,1,2); 
hash_fields="ip_dst,ip_src,tcp_dst,tcp_src");)
+])
+
+# 2. Check if the backend IPs are in the ipX.dst action
+AT_CHECK([grep "lr_in_dnat" lr1flows | ovn_strip_lflows | grep "30.0.0.1"], 
[0], [dnl
+  table=??(lr_in_dnat         ), priority=110  , 
match=(is_chassis_resident("cr-lr1-ts1") && ip4 && ip4.dst == 30.0.0.1 && 
reg1[[0..15]] == 0), action=(ip4.dst = 172.16.0.103; next;)
+  table=??(lr_in_dnat         ), priority=110  , 
match=(is_chassis_resident("cr-lr1-ts1") && ip4 && ip4.dst == 30.0.0.1 && 
reg1[[0..15]] == 1), action=(ip4.dst = 172.16.0.102; next;)
+  table=??(lr_in_dnat         ), priority=110  , 
match=(is_chassis_resident("cr-lr1-ts1") && ip4 && ip4.dst == 30.0.0.1 && 
reg1[[0..15]] == 2), action=(ip4.dst = 172.16.0.101; next;)
+  table=??(lr_in_dnat         ), priority=110  , 
match=(is_chassis_resident("cr-lr1-ts2") && ip4 && ip4.dst == 30.0.0.1 && 
reg1[[0..15]] == 0), action=(ip4.dst = 172.16.0.103; next;)
+  table=??(lr_in_dnat         ), priority=110  , 
match=(is_chassis_resident("cr-lr1-ts2") && ip4 && ip4.dst == 30.0.0.1 && 
reg1[[0..15]] == 1), action=(ip4.dst = 172.16.0.102; next;)
+  table=??(lr_in_dnat         ), priority=110  , 
match=(is_chassis_resident("cr-lr1-ts2") && ip4 && ip4.dst == 30.0.0.1 && 
reg1[[0..15]] == 2), action=(ip4.dst = 172.16.0.101; next;)
+  table=??(lr_in_dnat         ), priority=110  , 
match=(is_chassis_resident("cr-lr1_public") && ip4 && ip4.dst == 30.0.0.1 && 
reg1[[0..15]] == 0), action=(ip4.dst = 172.16.0.103; next;)
+  table=??(lr_in_dnat         ), priority=110  , 
match=(is_chassis_resident("cr-lr1_public") && ip4 && ip4.dst == 30.0.0.1 && 
reg1[[0..15]] == 1), action=(ip4.dst = 172.16.0.102; next;)
+  table=??(lr_in_dnat         ), priority=110  , 
match=(is_chassis_resident("cr-lr1_public") && ip4 && ip4.dst == 30.0.0.1 && 
reg1[[0..15]] == 2), action=(ip4.dst = 172.16.0.101; next;)
+])
+
+# 3. Check if the DGP ports are in the match with action next
 AT_CHECK([grep "lr_out_undnat" lr1flows | ovn_strip_lflows], [0], [dnl
   table=??(lr_out_undnat      ), priority=0    , match=(1), action=(next;)
   table=??(lr_out_undnat      ), priority=120  , match=(ip4 && ((ip4.src == 
172.16.0.103) || (ip4.src == 172.16.0.102) || (ip4.src == 172.16.0.101)) && 
(inport == "lr1-ts1" || outport == "lr1-ts1") && 
is_chassis_resident("cr-lr1-ts1") && tcp), action=(next;)
@@ -14484,7 +14536,7 @@ AT_CHECK([grep "lr_out_undnat" lr1flows | 
ovn_strip_lflows], [0], [dnl
   table=??(lr_out_undnat      ), priority=120  , match=(ip4 && ((ip4.src == 
172.16.0.103) || (ip4.src == 172.16.0.102) || (ip4.src == 172.16.0.101)) && 
(inport == "lr1_public" || outport == "lr1_public") && 
is_chassis_resident("cr-lr1_public") && tcp), action=(next;)
 ])
 
-# 3. Check if the VIP IP is in the ipX.src action
+# 4. Check if the VIP IP is in the ipX.src action
 AT_CHECK([grep "lr_out_snat" lr1flows | ovn_strip_lflows], [0], [dnl
   table=??(lr_out_snat        ), priority=0    , match=(1), action=(next;)
   table=??(lr_out_snat        ), priority=120  , match=(nd_ns), action=(next;)
@@ -14493,6 +14545,51 @@ AT_CHECK([grep "lr_out_snat" lr1flows | 
ovn_strip_lflows], [0], [dnl
   table=??(lr_out_snat        ), priority=160  , match=(ip4 && ((ip4.src == 
172.16.0.103) || (ip4.src == 172.16.0.102) || (ip4.src == 172.16.0.101)) && 
(inport == "lr1_public" || outport == "lr1_public") && 
is_chassis_resident("cr-lr1_public") && tcp), action=(ip4.src = 30.0.0.1; next;)
 ])
 
+# Delete LB and create with one backend
+check ovn-nbctl --wait=sb lb-del lb1
+check ovn-nbctl --wait=sb lb-add lb1 "30.0.0.1" "172.16.0.103"
+
+# Set use_stateless_nat to true
+check ovn-nbctl --wait=sb set load_balancer lb1 options:use_stateless_nat=true
+
+# Associate load balancer to s1
+check ovn-nbctl ls-lb-add s1 lb1
+check ovn-nbctl lr-lb-add lr1 lb1
+check ovn-nbctl --wait=sb sync
+
+ovn-sbctl dump-flows lr1 > lr1flows
+AT_CAPTURE_FILE([lr1flows])
+
+# 1. Check if the reg1[0..15] will select one of backends using hash_fields
+AT_CHECK([grep "lr_in_ct_extract" lr1flows | ovn_strip_lflows | grep 
"30.0.0.1"], [0], [dnl
+  table=??(lr_in_ct_extract   ), priority=120  , match=(ip && ip4.dst == 
30.0.0.1), action=(next;)
+])
+
+# 2. Check if the backend IPs are in the ipX.dst action
+AT_CHECK([grep "lr_in_dnat" lr1flows | ovn_strip_lflows | grep "30.0.0.1"], 
[0], [dnl
+  table=??(lr_in_dnat         ), priority=110  , 
match=(is_chassis_resident("cr-lr1-ts1") && ip4 && ip4.dst == 30.0.0.1), 
action=(ip4.dst = 172.16.0.103; next;)
+  table=??(lr_in_dnat         ), priority=110  , 
match=(is_chassis_resident("cr-lr1-ts2") && ip4 && ip4.dst == 30.0.0.1), 
action=(ip4.dst = 172.16.0.103; next;)
+  table=??(lr_in_dnat         ), priority=110  , 
match=(is_chassis_resident("cr-lr1_public") && ip4 && ip4.dst == 30.0.0.1), 
action=(ip4.dst = 172.16.0.103; next;)
+])
+
+# 3. Check if the DGP ports are in the match with action next
+AT_CHECK([grep "lr_out_undnat" lr1flows | ovn_strip_lflows], [0], [dnl
+  table=??(lr_out_undnat      ), priority=0    , match=(1), action=(next;)
+  table=??(lr_out_undnat      ), priority=120  , match=(ip4 && ((ip4.src == 
172.16.0.103)) && (inport == "lr1-ts1" || outport == "lr1-ts1") && 
is_chassis_resident("cr-lr1-ts1") && tcp), action=(next;)
+  table=??(lr_out_undnat      ), priority=120  , match=(ip4 && ((ip4.src == 
172.16.0.103)) && (inport == "lr1-ts2" || outport == "lr1-ts2") && 
is_chassis_resident("cr-lr1-ts2") && tcp), action=(next;)
+  table=??(lr_out_undnat      ), priority=120  , match=(ip4 && ((ip4.src == 
172.16.0.103)) && (inport == "lr1_public" || outport == "lr1_public") && 
is_chassis_resident("cr-lr1_public") && tcp), action=(next;)
+])
+
+# 4. Check if the VIP IP is in the ipX.src action
+AT_CHECK([grep "lr_out_snat" lr1flows | ovn_strip_lflows], [0], [dnl
+  table=??(lr_out_snat        ), priority=0    , match=(1), action=(next;)
+  table=??(lr_out_snat        ), priority=120  , match=(nd_ns), action=(next;)
+  table=??(lr_out_snat        ), priority=160  , match=(ip4 && ((ip4.src == 
172.16.0.103)) && (inport == "lr1-ts1" || outport == "lr1-ts1") && 
is_chassis_resident("cr-lr1-ts1") && tcp), action=(ip4.src = 30.0.0.1; next;)
+  table=??(lr_out_snat        ), priority=160  , match=(ip4 && ((ip4.src == 
172.16.0.103)) && (inport == "lr1-ts2" || outport == "lr1-ts2") && 
is_chassis_resident("cr-lr1-ts2") && tcp), action=(ip4.src = 30.0.0.1; next;)
+  table=??(lr_out_snat        ), priority=160  , match=(ip4 && ((ip4.src == 
172.16.0.103)) && (inport == "lr1_public" || outport == "lr1_public") && 
is_chassis_resident("cr-lr1_public") && tcp), action=(ip4.src = 30.0.0.1; next;)
+])
+
+
 AT_CLEANUP
 ])
 
@@ -14583,14 +14680,67 @@ ovn-sbctl dump-flows lr1 > lr1flows
 AT_CAPTURE_FILE([lr1flows])
 
 # Check stateless NAT rules for load balancer with multiple DGP
-# 1. Check if the backend IPs are in the ipX.dst action
+# 1. Check if the reg1[0..15] will select one of backends
+AT_CHECK([grep "lr_in_ct_extract" lr1flows | ovn_strip_lflows | grep 
"2001:db8:cccc::1"], [0], [dnl
+  table=??(lr_in_ct_extract   ), priority=120  , match=(ip && ip6.dst == 
2001:db8:cccc::1), action=(reg1[[0..15]] = select(0,1,2);)
+])
+
+# 2. Check if the backend IPs are in the ipX.dst action
 AT_CHECK([grep "lr_in_dnat" lr1flows | ovn_strip_lflows | grep 
"2001:db8:cccc::1"], [0], [dnl
-  table=??(lr_in_dnat         ), priority=110  , match=(ct.new && !ct.rel && 
ip6 && ip6.dst == 2001:db8:cccc::1 && is_chassis_resident("cr-lr1-ts1")), 
action=(ip6.dst = 2001:db8:aaaa:3::103; 
ct_lb_mark(backends=2001:db8:aaaa:3::103,2001:db8:aaaa:3::102,2001:db8:aaaa:3::101);)
-  table=??(lr_in_dnat         ), priority=110  , match=(ct.new && !ct.rel && 
ip6 && ip6.dst == 2001:db8:cccc::1 && is_chassis_resident("cr-lr1-ts2")), 
action=(ip6.dst = 2001:db8:aaaa:3::103; 
ct_lb_mark(backends=2001:db8:aaaa:3::103,2001:db8:aaaa:3::102,2001:db8:aaaa:3::101);)
-  table=??(lr_in_dnat         ), priority=110  , match=(ct.new && !ct.rel && 
ip6 && ip6.dst == 2001:db8:cccc::1 && is_chassis_resident("cr-lr1_public")), 
action=(ip6.dst = 2001:db8:aaaa:3::103; 
ct_lb_mark(backends=2001:db8:aaaa:3::103,2001:db8:aaaa:3::102,2001:db8:aaaa:3::101);)
+  table=??(lr_in_dnat         ), priority=110  , 
match=(is_chassis_resident("cr-lr1-ts1") && ip6 && ip6.dst == 2001:db8:cccc::1 
&& reg1[[0..15]] == 0), action=(ip6.dst = 2001:db8:aaaa:3::103; next;)
+  table=??(lr_in_dnat         ), priority=110  , 
match=(is_chassis_resident("cr-lr1-ts1") && ip6 && ip6.dst == 2001:db8:cccc::1 
&& reg1[[0..15]] == 1), action=(ip6.dst = 2001:db8:aaaa:3::102; next;)
+  table=??(lr_in_dnat         ), priority=110  , 
match=(is_chassis_resident("cr-lr1-ts1") && ip6 && ip6.dst == 2001:db8:cccc::1 
&& reg1[[0..15]] == 2), action=(ip6.dst = 2001:db8:aaaa:3::101; next;)
+  table=??(lr_in_dnat         ), priority=110  , 
match=(is_chassis_resident("cr-lr1-ts2") && ip6 && ip6.dst == 2001:db8:cccc::1 
&& reg1[[0..15]] == 0), action=(ip6.dst = 2001:db8:aaaa:3::103; next;)
+  table=??(lr_in_dnat         ), priority=110  , 
match=(is_chassis_resident("cr-lr1-ts2") && ip6 && ip6.dst == 2001:db8:cccc::1 
&& reg1[[0..15]] == 1), action=(ip6.dst = 2001:db8:aaaa:3::102; next;)
+  table=??(lr_in_dnat         ), priority=110  , 
match=(is_chassis_resident("cr-lr1-ts2") && ip6 && ip6.dst == 2001:db8:cccc::1 
&& reg1[[0..15]] == 2), action=(ip6.dst = 2001:db8:aaaa:3::101; next;)
+  table=??(lr_in_dnat         ), priority=110  , 
match=(is_chassis_resident("cr-lr1_public") && ip6 && ip6.dst == 
2001:db8:cccc::1 && reg1[[0..15]] == 0), action=(ip6.dst = 
2001:db8:aaaa:3::103; next;)
+  table=??(lr_in_dnat         ), priority=110  , 
match=(is_chassis_resident("cr-lr1_public") && ip6 && ip6.dst == 
2001:db8:cccc::1 && reg1[[0..15]] == 1), action=(ip6.dst = 
2001:db8:aaaa:3::102; next;)
+  table=??(lr_in_dnat         ), priority=110  , 
match=(is_chassis_resident("cr-lr1_public") && ip6 && ip6.dst == 
2001:db8:cccc::1 && reg1[[0..15]] == 2), action=(ip6.dst = 
2001:db8:aaaa:3::101; next;)
+])
+
+# 3. Check if the DGP ports are in the match with action next
+AT_CHECK([grep "lr_out_undnat" lr1flows | ovn_strip_lflows], [0], [dnl
+  table=??(lr_out_undnat      ), priority=0    , match=(1), action=(next;)
+  table=??(lr_out_undnat      ), priority=120  , match=(ip6 && ((ip6.src == 
2001:db8:aaaa:3::103) || (ip6.src == 2001:db8:aaaa:3::102) || (ip6.src == 
2001:db8:aaaa:3::101)) && (inport == "lr1-ts1" || outport == "lr1-ts1") && 
is_chassis_resident("cr-lr1-ts1") && tcp), action=(next;)
+  table=??(lr_out_undnat      ), priority=120  , match=(ip6 && ((ip6.src == 
2001:db8:aaaa:3::103) || (ip6.src == 2001:db8:aaaa:3::102) || (ip6.src == 
2001:db8:aaaa:3::101)) && (inport == "lr1-ts2" || outport == "lr1-ts2") && 
is_chassis_resident("cr-lr1-ts2") && tcp), action=(next;)
+  table=??(lr_out_undnat      ), priority=120  , match=(ip6 && ((ip6.src == 
2001:db8:aaaa:3::103) || (ip6.src == 2001:db8:aaaa:3::102) || (ip6.src == 
2001:db8:aaaa:3::101)) && (inport == "lr1_public" || outport == "lr1_public") 
&& is_chassis_resident("cr-lr1_public") && tcp), action=(next;)
 ])
 
-# 2. Check if the DGP ports are in the match with action next
+# 4. Check if the VIP IP is in the ipX.src action
+AT_CHECK([grep "lr_out_snat" lr1flows | ovn_strip_lflows], [0], [dnl
+  table=??(lr_out_snat        ), priority=0    , match=(1), action=(next;)
+  table=??(lr_out_snat        ), priority=120  , match=(nd_ns), action=(next;)
+  table=??(lr_out_snat        ), priority=160  , match=(ip6 && ((ip6.src == 
2001:db8:aaaa:3::103) || (ip6.src == 2001:db8:aaaa:3::102) || (ip6.src == 
2001:db8:aaaa:3::101)) && (inport == "lr1-ts1" || outport == "lr1-ts1") && 
is_chassis_resident("cr-lr1-ts1") && tcp), action=(ip6.src = 2001:db8:cccc::1; 
next;)
+  table=??(lr_out_snat        ), priority=160  , match=(ip6 && ((ip6.src == 
2001:db8:aaaa:3::103) || (ip6.src == 2001:db8:aaaa:3::102) || (ip6.src == 
2001:db8:aaaa:3::101)) && (inport == "lr1-ts2" || outport == "lr1-ts2") && 
is_chassis_resident("cr-lr1-ts2") && tcp), action=(ip6.src = 2001:db8:cccc::1; 
next;)
+  table=??(lr_out_snat        ), priority=160  , match=(ip6 && ((ip6.src == 
2001:db8:aaaa:3::103) || (ip6.src == 2001:db8:aaaa:3::102) || (ip6.src == 
2001:db8:aaaa:3::101)) && (inport == "lr1_public" || outport == "lr1_public") 
&& is_chassis_resident("cr-lr1_public") && tcp), action=(ip6.src = 
2001:db8:cccc::1; next;)
+])
+
+# Set selection fields
+check ovn-nbctl --wait=sb set load_balancer lb1 
selection_fields="ip_src,tp_src,ip_dst,tp_dst"
+
+ovn-sbctl dump-flows lr1 > lr1flows
+AT_CAPTURE_FILE([lr1flows])
+
+# Check stateless NAT rules for load balancer with multiple DGP
+# 1. Check if the reg1[0..15] will select one of backends
+AT_CHECK([grep "lr_in_ct_extract" lr1flows | ovn_strip_lflows | grep 
"2001:db8:cccc::1"], [0], [dnl
+  table=??(lr_in_ct_extract   ), priority=120  , match=(ip && ip6.dst == 
2001:db8:cccc::1), action=(reg1[[0..15]] = select(values=(0,1,2); 
hash_fields="ip_dst,ip_src,tcp_dst,tcp_src");)
+])
+
+# 2. Check if the backend IPs are in the ipX.dst action
+AT_CHECK([grep "lr_in_dnat" lr1flows | ovn_strip_lflows | grep 
"2001:db8:cccc::1"], [0], [dnl
+  table=??(lr_in_dnat         ), priority=110  , 
match=(is_chassis_resident("cr-lr1-ts1") && ip6 && ip6.dst == 2001:db8:cccc::1 
&& reg1[[0..15]] == 0), action=(ip6.dst = 2001:db8:aaaa:3::103; next;)
+  table=??(lr_in_dnat         ), priority=110  , 
match=(is_chassis_resident("cr-lr1-ts1") && ip6 && ip6.dst == 2001:db8:cccc::1 
&& reg1[[0..15]] == 1), action=(ip6.dst = 2001:db8:aaaa:3::102; next;)
+  table=??(lr_in_dnat         ), priority=110  , 
match=(is_chassis_resident("cr-lr1-ts1") && ip6 && ip6.dst == 2001:db8:cccc::1 
&& reg1[[0..15]] == 2), action=(ip6.dst = 2001:db8:aaaa:3::101; next;)
+  table=??(lr_in_dnat         ), priority=110  , 
match=(is_chassis_resident("cr-lr1-ts2") && ip6 && ip6.dst == 2001:db8:cccc::1 
&& reg1[[0..15]] == 0), action=(ip6.dst = 2001:db8:aaaa:3::103; next;)
+  table=??(lr_in_dnat         ), priority=110  , 
match=(is_chassis_resident("cr-lr1-ts2") && ip6 && ip6.dst == 2001:db8:cccc::1 
&& reg1[[0..15]] == 1), action=(ip6.dst = 2001:db8:aaaa:3::102; next;)
+  table=??(lr_in_dnat         ), priority=110  , 
match=(is_chassis_resident("cr-lr1-ts2") && ip6 && ip6.dst == 2001:db8:cccc::1 
&& reg1[[0..15]] == 2), action=(ip6.dst = 2001:db8:aaaa:3::101; next;)
+  table=??(lr_in_dnat         ), priority=110  , 
match=(is_chassis_resident("cr-lr1_public") && ip6 && ip6.dst == 
2001:db8:cccc::1 && reg1[[0..15]] == 0), action=(ip6.dst = 
2001:db8:aaaa:3::103; next;)
+  table=??(lr_in_dnat         ), priority=110  , 
match=(is_chassis_resident("cr-lr1_public") && ip6 && ip6.dst == 
2001:db8:cccc::1 && reg1[[0..15]] == 1), action=(ip6.dst = 
2001:db8:aaaa:3::102; next;)
+  table=??(lr_in_dnat         ), priority=110  , 
match=(is_chassis_resident("cr-lr1_public") && ip6 && ip6.dst == 
2001:db8:cccc::1 && reg1[[0..15]] == 2), action=(ip6.dst = 
2001:db8:aaaa:3::101; next;)
+])
+
+# 3. Check if the DGP ports are in the match with action next
 AT_CHECK([grep "lr_out_undnat" lr1flows | ovn_strip_lflows], [0], [dnl
   table=??(lr_out_undnat      ), priority=0    , match=(1), action=(next;)
   table=??(lr_out_undnat      ), priority=120  , match=(ip6 && ((ip6.src == 
2001:db8:aaaa:3::103) || (ip6.src == 2001:db8:aaaa:3::102) || (ip6.src == 
2001:db8:aaaa:3::101)) && (inport == "lr1-ts1" || outport == "lr1-ts1") && 
is_chassis_resident("cr-lr1-ts1") && tcp), action=(next;)
@@ -14598,7 +14748,7 @@ AT_CHECK([grep "lr_out_undnat" lr1flows | 
ovn_strip_lflows], [0], [dnl
   table=??(lr_out_undnat      ), priority=120  , match=(ip6 && ((ip6.src == 
2001:db8:aaaa:3::103) || (ip6.src == 2001:db8:aaaa:3::102) || (ip6.src == 
2001:db8:aaaa:3::101)) && (inport == "lr1_public" || outport == "lr1_public") 
&& is_chassis_resident("cr-lr1_public") && tcp), action=(next;)
 ])
 
-# 3. Check if the VIP IP is in the ipX.src action
+# 4. Check if the VIP IP is in the ipX.src action
 AT_CHECK([grep "lr_out_snat" lr1flows | ovn_strip_lflows], [0], [dnl
   table=??(lr_out_snat        ), priority=0    , match=(1), action=(next;)
   table=??(lr_out_snat        ), priority=120  , match=(nd_ns), action=(next;)
@@ -14607,6 +14757,50 @@ AT_CHECK([grep "lr_out_snat" lr1flows | 
ovn_strip_lflows], [0], [dnl
   table=??(lr_out_snat        ), priority=160  , match=(ip6 && ((ip6.src == 
2001:db8:aaaa:3::103) || (ip6.src == 2001:db8:aaaa:3::102) || (ip6.src == 
2001:db8:aaaa:3::101)) && (inport == "lr1_public" || outport == "lr1_public") 
&& is_chassis_resident("cr-lr1_public") && tcp), action=(ip6.src = 
2001:db8:cccc::1; next;)
 ])
 
+# Delete LB and create with one backend
+check ovn-nbctl --wait=sb lb-del lb1
+check ovn-nbctl --wait=sb lb-add lb1 "2001:db8:cccc::1" "2001:db8:aaaa:3::103"
+
+# Set use_stateless_nat to true
+check ovn-nbctl --wait=sb set load_balancer lb1 options:use_stateless_nat=true
+
+# Associate load balancer to s1
+check ovn-nbctl ls-lb-add s1 lb1
+check ovn-nbctl lr-lb-add lr1 lb1
+check ovn-nbctl --wait=sb sync
+
+ovn-sbctl dump-flows lr1 > lr1flows
+AT_CAPTURE_FILE([lr1flows])
+# Check stateless NAT rules for load balancer with multiple DGP
+# 1. Check if the reg1[0..15] will select one of backends
+AT_CHECK([grep "lr_in_ct_extract" lr1flows | ovn_strip_lflows | grep 
"2001:db8:cccc::1"], [0], [dnl
+  table=??(lr_in_ct_extract   ), priority=120  , match=(ip && ip6.dst == 
2001:db8:cccc::1), action=(next;)
+])
+
+# 2. Check if the backend IPs are in the ipX.dst action
+AT_CHECK([grep "lr_in_dnat" lr1flows | ovn_strip_lflows | grep 
"2001:db8:cccc::1"], [0], [dnl
+  table=??(lr_in_dnat         ), priority=110  , 
match=(is_chassis_resident("cr-lr1-ts1") && ip6 && ip6.dst == 
2001:db8:cccc::1), action=(ip6.dst = 2001:db8:aaaa:3::103; next;)
+  table=??(lr_in_dnat         ), priority=110  , 
match=(is_chassis_resident("cr-lr1-ts2") && ip6 && ip6.dst == 
2001:db8:cccc::1), action=(ip6.dst = 2001:db8:aaaa:3::103; next;)
+  table=??(lr_in_dnat         ), priority=110  , 
match=(is_chassis_resident("cr-lr1_public") && ip6 && ip6.dst == 
2001:db8:cccc::1), action=(ip6.dst = 2001:db8:aaaa:3::103; next;)
+])
+
+# 3. Check if the DGP ports are in the match with action next
+AT_CHECK([grep "lr_out_undnat" lr1flows | ovn_strip_lflows], [0], [dnl
+  table=??(lr_out_undnat      ), priority=0    , match=(1), action=(next;)
+  table=??(lr_out_undnat      ), priority=120  , match=(ip6 && ((ip6.src == 
2001:db8:aaaa:3::103)) && (inport == "lr1-ts1" || outport == "lr1-ts1") && 
is_chassis_resident("cr-lr1-ts1") && tcp), action=(next;)
+  table=??(lr_out_undnat      ), priority=120  , match=(ip6 && ((ip6.src == 
2001:db8:aaaa:3::103)) && (inport == "lr1-ts2" || outport == "lr1-ts2") && 
is_chassis_resident("cr-lr1-ts2") && tcp), action=(next;)
+  table=??(lr_out_undnat      ), priority=120  , match=(ip6 && ((ip6.src == 
2001:db8:aaaa:3::103)) && (inport == "lr1_public" || outport == "lr1_public") 
&& is_chassis_resident("cr-lr1_public") && tcp), action=(next;)
+])
+
+# 4. Check if the VIP IP is in the ipX.src action
+AT_CHECK([grep "lr_out_snat" lr1flows | ovn_strip_lflows], [0], [dnl
+  table=??(lr_out_snat        ), priority=0    , match=(1), action=(next;)
+  table=??(lr_out_snat        ), priority=120  , match=(nd_ns), action=(next;)
+  table=??(lr_out_snat        ), priority=160  , match=(ip6 && ((ip6.src == 
2001:db8:aaaa:3::103)) && (inport == "lr1-ts1" || outport == "lr1-ts1") && 
is_chassis_resident("cr-lr1-ts1") && tcp), action=(ip6.src = 2001:db8:cccc::1; 
next;)
+  table=??(lr_out_snat        ), priority=160  , match=(ip6 && ((ip6.src == 
2001:db8:aaaa:3::103)) && (inport == "lr1-ts2" || outport == "lr1-ts2") && 
is_chassis_resident("cr-lr1-ts2") && tcp), action=(ip6.src = 2001:db8:cccc::1; 
next;)
+  table=??(lr_out_snat        ), priority=160  , match=(ip6 && ((ip6.src == 
2001:db8:aaaa:3::103)) && (inport == "lr1_public" || outport == "lr1_public") 
&& is_chassis_resident("cr-lr1_public") && tcp), action=(ip6.src = 
2001:db8:cccc::1; next;)
+])
+
 AT_CLEANUP
 ])
 
-- 
2.43.0


-- 




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