On 9/12/23 13:57, [email protected] wrote:
> From: shylou <[email protected]>
>
> OVN had fix the issue[1] that avoid snat on reply packets for
> gateway router. It is also needed to be dealt with for dgw.
>
> [1]https://github.com/ovn-org/ovn/commit/8b3e1afc30
>
> Signed-off-by: Xie Liu <[email protected]>
> ---
Hi, Xie Liu,
Sorry for taking long to review this patch.
> northd/northd.c | 4 ++++
> tests/ovn-northd.at | 56 ++++++++++++++++++++++-----------------------
> tests/ovn.at | 4 ++--
> 3 files changed, 34 insertions(+), 30 deletions(-)
>
> diff --git a/northd/northd.c b/northd/northd.c
> index 3eaa43f07..91a6e3f79 100644
> --- a/northd/northd.c
> +++ b/northd/northd.c
> @@ -14648,6 +14648,8 @@ build_lrouter_out_snat_in_czone_flow(struct hmap
> *lflows,
For context, the condition here is (the same as for the second chunk of
the diff):
if (distributed_nat) {
...
> ETH_ADDR_ARGS(mac));
> ds_put_format(&zone_actions, "eth.src = "ETH_ADDR_FMT"; ",
> ETH_ADDR_ARGS(mac));
> + } else {
> + ds_put_format(match, " && (!ct.trk || !ct.rpl)");
> }
>
> ds_put_cstr(&zone_actions, REGBIT_DST_NAT_IP_LOCAL" = 0; ");
> @@ -14706,6 +14708,8 @@ build_lrouter_out_snat_flow(struct hmap *lflows,
> struct ovn_datapath *od,
> if (distributed_nat) {
> ds_put_format(actions, "eth.src = "ETH_ADDR_FMT"; ",
> ETH_ADDR_ARGS(mac));
> + } else {
> + ds_put_format(match, " && (!ct.trk || !ct.rpl)");
> }
> } else {
I'm wondering why do we need to ski[ the case with "dnat_and_snat" and
logical_port and external_mac set. Can't we just move the new line
outside the "if (distributed_nat)"?
Thanks,
Dumitru
> /* Gateway router. */
> diff --git a/tests/ovn-northd.at b/tests/ovn-northd.at
> index 23dbe111f..ce3de2048 100644
> --- a/tests/ovn-northd.at
> +++ b/tests/ovn-northd.at
> @@ -1100,7 +1100,7 @@ AT_CAPTURE_FILE([crflows])
> AT_CHECK([grep -e "lr_out_snat" drflows | sed 's/table=../table=??/' |
> sort], [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=161 , match=(ip && ip4.src ==
> 50.0.0.11 && outport == "DR-S1" && is_chassis_resident("cr-DR-S1") && ip4.dst
> == $allowed_range), action=(ct_snat(172.16.1.1);)
> + table=??(lr_out_snat ), priority=161 , match=(ip && ip4.src ==
> 50.0.0.11 && outport == "DR-S1" && is_chassis_resident("cr-DR-S1") && ip4.dst
> == $allowed_range && (!ct.trk || !ct.rpl)), action=(ct_snat(172.16.1.1);)
> ])
>
> AT_CHECK([grep -e "lr_out_snat" crflows | sed 's/table=../table=??/' |
> sort], [0], [dnl
> @@ -1130,7 +1130,7 @@ AT_CAPTURE_FILE([crflows2])
> AT_CHECK([grep -e "lr_out_snat" drflows2 | sed 's/table=../table=??/' |
> sort], [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=161 , match=(ip && ip4.src ==
> 50.0.0.11 && outport == "DR-S1" && is_chassis_resident("cr-DR-S1")),
> action=(ct_snat(172.16.1.1);)
> + table=??(lr_out_snat ), priority=161 , match=(ip && ip4.src ==
> 50.0.0.11 && outport == "DR-S1" && is_chassis_resident("cr-DR-S1") &&
> (!ct.trk || !ct.rpl)), action=(ct_snat(172.16.1.1);)
> table=??(lr_out_snat ), priority=163 , match=(ip && ip4.src ==
> 50.0.0.11 && outport == "DR-S1" && is_chassis_resident("cr-DR-S1") && ip4.dst
> == $disallowed_range), action=(next;)
> ])
>
> @@ -1159,7 +1159,7 @@ AT_CAPTURE_FILE([crflows2])
> AT_CHECK([grep -e "lr_out_snat" drflows3 | sed 's/table=../table=??/' |
> sort], [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=161 , match=(ip && ip4.src ==
> 50.0.0.11 && outport == "DR-S1" && is_chassis_resident("cr-DR-S1") && ip4.dst
> == $allowed_range), action=(ct_snat(172.16.1.2);)
> + table=??(lr_out_snat ), priority=161 , match=(ip && ip4.src ==
> 50.0.0.11 && outport == "DR-S1" && is_chassis_resident("cr-DR-S1") && ip4.dst
> == $allowed_range && (!ct.trk || !ct.rpl)), action=(ct_snat(172.16.1.2);)
> ])
>
> AT_CHECK([grep -e "lr_out_snat" crflows3 | sed 's/table=../table=??/' |
> sort], [0], [dnl
> @@ -1186,7 +1186,7 @@ AT_CAPTURE_FILE([crflows2])
> AT_CHECK([grep -e "lr_out_snat" drflows4 | sed 's/table=../table=??/' |
> sort], [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=161 , match=(ip && ip4.src ==
> 50.0.0.11 && outport == "DR-S1" && is_chassis_resident("cr-DR-S1")),
> action=(ct_snat(172.16.1.2);)
> + table=??(lr_out_snat ), priority=161 , match=(ip && ip4.src ==
> 50.0.0.11 && outport == "DR-S1" && is_chassis_resident("cr-DR-S1") &&
> (!ct.trk || !ct.rpl)), action=(ct_snat(172.16.1.2);)
> table=??(lr_out_snat ), priority=163 , match=(ip && ip4.src ==
> 50.0.0.11 && outport == "DR-S1" && is_chassis_resident("cr-DR-S1") && ip4.dst
> == $disallowed_range), action=(next;)
> ])
>
> @@ -5352,12 +5352,12 @@ AT_CHECK([grep "lr_out_post_undnat" lr0flows | sed
> 's/table=./table=?/' | sort],
> AT_CHECK([grep "lr_out_snat" lr0flows | sed 's/table=./table=?/' | sort],
> [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=153 , match=(ip && ip4.src ==
> 10.0.0.0/24 && outport == "lr0-public" &&
> is_chassis_resident("cr-lr0-public")),
> action=(ct_snat_in_czone(172.168.0.10);)
> - table=? (lr_out_snat ), priority=154 , match=(ip && ip4.src ==
> 10.0.0.0/24 && outport == "lr0-public" &&
> is_chassis_resident("cr-lr0-public") && reg9[[4]] == 1), action=(reg9[[4]] =
> 0; ct_snat(172.168.0.10);)
> - table=? (lr_out_snat ), priority=161 , match=(ip && ip4.src ==
> 10.0.0.10 && outport == "lr0-public" &&
> is_chassis_resident("cr-lr0-public")),
> action=(ct_snat_in_czone(172.168.0.30);)
> - table=? (lr_out_snat ), priority=161 , match=(ip && ip4.src ==
> 10.0.0.3 && outport == "lr0-public" && is_chassis_resident("cr-lr0-public")),
> action=(ct_snat_in_czone(172.168.0.20);)
> - table=? (lr_out_snat ), priority=162 , match=(ip && ip4.src ==
> 10.0.0.10 && outport == "lr0-public" && is_chassis_resident("cr-lr0-public")
> && reg9[[4]] == 1), action=(reg9[[4]] = 0; ct_snat(172.168.0.30);)
> - table=? (lr_out_snat ), priority=162 , match=(ip && ip4.src ==
> 10.0.0.3 && outport == "lr0-public" && is_chassis_resident("cr-lr0-public")
> && reg9[[4]] == 1), action=(reg9[[4]] = 0; ct_snat(172.168.0.20);)
> + table=? (lr_out_snat ), priority=153 , match=(ip && ip4.src ==
> 10.0.0.0/24 && outport == "lr0-public" &&
> is_chassis_resident("cr-lr0-public") && (!ct.trk || !ct.rpl)),
> action=(ct_snat_in_czone(172.168.0.10);)
> + table=? (lr_out_snat ), priority=154 , match=(ip && ip4.src ==
> 10.0.0.0/24 && outport == "lr0-public" &&
> is_chassis_resident("cr-lr0-public") && (!ct.trk || !ct.rpl) && reg9[[4]] ==
> 1), action=(reg9[[4]] = 0; ct_snat(172.168.0.10);)
> + table=? (lr_out_snat ), priority=161 , match=(ip && ip4.src ==
> 10.0.0.10 && outport == "lr0-public" && is_chassis_resident("cr-lr0-public")
> && (!ct.trk || !ct.rpl)), action=(ct_snat_in_czone(172.168.0.30);)
> + table=? (lr_out_snat ), priority=161 , match=(ip && ip4.src ==
> 10.0.0.3 && outport == "lr0-public" && is_chassis_resident("cr-lr0-public")
> && (!ct.trk || !ct.rpl)), action=(ct_snat_in_czone(172.168.0.20);)
> + table=? (lr_out_snat ), priority=162 , match=(ip && ip4.src ==
> 10.0.0.10 && outport == "lr0-public" && is_chassis_resident("cr-lr0-public")
> && (!ct.trk || !ct.rpl) && reg9[[4]] == 1), action=(reg9[[4]] = 0;
> ct_snat(172.168.0.30);)
> + table=? (lr_out_snat ), priority=162 , match=(ip && ip4.src ==
> 10.0.0.3 && outport == "lr0-public" && is_chassis_resident("cr-lr0-public")
> && (!ct.trk || !ct.rpl) && reg9[[4]] == 1), action=(reg9[[4]] = 0;
> ct_snat(172.168.0.20);)
> ])
>
> # Separate zones for DGP
> @@ -5400,9 +5400,9 @@ AT_CHECK([grep "lr_out_post_undnat" lr0flows | sed
> 's/table=./table=?/' | sort],
> AT_CHECK([grep "lr_out_snat" lr0flows | sed 's/table=./table=?/' | sort],
> [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=153 , match=(ip && ip4.src ==
> 10.0.0.0/24 && outport == "lr0-public" &&
> is_chassis_resident("cr-lr0-public")), action=(ct_snat(172.168.0.10);)
> - table=? (lr_out_snat ), priority=161 , match=(ip && ip4.src ==
> 10.0.0.10 && outport == "lr0-public" &&
> is_chassis_resident("cr-lr0-public")), action=(ct_snat(172.168.0.30);)
> - table=? (lr_out_snat ), priority=161 , match=(ip && ip4.src ==
> 10.0.0.3 && outport == "lr0-public" && is_chassis_resident("cr-lr0-public")),
> action=(ct_snat(172.168.0.20);)
> + table=? (lr_out_snat ), priority=153 , match=(ip && ip4.src ==
> 10.0.0.0/24 && outport == "lr0-public" &&
> is_chassis_resident("cr-lr0-public") && (!ct.trk || !ct.rpl)),
> action=(ct_snat(172.168.0.10);)
> + table=? (lr_out_snat ), priority=161 , match=(ip && ip4.src ==
> 10.0.0.10 && outport == "lr0-public" && is_chassis_resident("cr-lr0-public")
> && (!ct.trk || !ct.rpl)), action=(ct_snat(172.168.0.30);)
> + table=? (lr_out_snat ), priority=161 , match=(ip && ip4.src ==
> 10.0.0.3 && outport == "lr0-public" && is_chassis_resident("cr-lr0-public")
> && (!ct.trk || !ct.rpl)), action=(ct_snat(172.168.0.20);)
> ])
>
> # Associate load balancer to lr0
> @@ -5482,12 +5482,12 @@ AT_CHECK([grep "lr_out_post_undnat" lr0flows | sed
> 's/table=./table=?/' | sort],
> AT_CHECK([grep "lr_out_snat" lr0flows | sed 's/table=./table=?/' | sort],
> [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=153 , match=(ip && ip4.src ==
> 10.0.0.0/24 && outport == "lr0-public" &&
> is_chassis_resident("cr-lr0-public")),
> action=(ct_snat_in_czone(172.168.0.10);)
> - table=? (lr_out_snat ), priority=154 , match=(ip && ip4.src ==
> 10.0.0.0/24 && outport == "lr0-public" &&
> is_chassis_resident("cr-lr0-public") && reg9[[4]] == 1), action=(reg9[[4]] =
> 0; ct_snat(172.168.0.10);)
> - table=? (lr_out_snat ), priority=161 , match=(ip && ip4.src ==
> 10.0.0.10 && outport == "lr0-public" &&
> is_chassis_resident("cr-lr0-public")),
> action=(ct_snat_in_czone(172.168.0.30);)
> - table=? (lr_out_snat ), priority=161 , match=(ip && ip4.src ==
> 10.0.0.3 && outport == "lr0-public" && is_chassis_resident("cr-lr0-public")),
> action=(ct_snat_in_czone(172.168.0.20);)
> - table=? (lr_out_snat ), priority=162 , match=(ip && ip4.src ==
> 10.0.0.10 && outport == "lr0-public" && is_chassis_resident("cr-lr0-public")
> && reg9[[4]] == 1), action=(reg9[[4]] = 0; ct_snat(172.168.0.30);)
> - table=? (lr_out_snat ), priority=162 , match=(ip && ip4.src ==
> 10.0.0.3 && outport == "lr0-public" && is_chassis_resident("cr-lr0-public")
> && reg9[[4]] == 1), action=(reg9[[4]] = 0; ct_snat(172.168.0.20);)
> + table=? (lr_out_snat ), priority=153 , match=(ip && ip4.src ==
> 10.0.0.0/24 && outport == "lr0-public" &&
> is_chassis_resident("cr-lr0-public") && (!ct.trk || !ct.rpl)),
> action=(ct_snat_in_czone(172.168.0.10);)
> + table=? (lr_out_snat ), priority=154 , match=(ip && ip4.src ==
> 10.0.0.0/24 && outport == "lr0-public" &&
> is_chassis_resident("cr-lr0-public") && (!ct.trk || !ct.rpl) && reg9[[4]] ==
> 1), action=(reg9[[4]] = 0; ct_snat(172.168.0.10);)
> + table=? (lr_out_snat ), priority=161 , match=(ip && ip4.src ==
> 10.0.0.10 && outport == "lr0-public" && is_chassis_resident("cr-lr0-public")
> && (!ct.trk || !ct.rpl)), action=(ct_snat_in_czone(172.168.0.30);)
> + table=? (lr_out_snat ), priority=161 , match=(ip && ip4.src ==
> 10.0.0.3 && outport == "lr0-public" && is_chassis_resident("cr-lr0-public")
> && (!ct.trk || !ct.rpl)), action=(ct_snat_in_czone(172.168.0.20);)
> + table=? (lr_out_snat ), priority=162 , match=(ip && ip4.src ==
> 10.0.0.10 && outport == "lr0-public" && is_chassis_resident("cr-lr0-public")
> && (!ct.trk || !ct.rpl) && reg9[[4]] == 1), action=(reg9[[4]] = 0;
> ct_snat(172.168.0.30);)
> + table=? (lr_out_snat ), priority=162 , match=(ip && ip4.src ==
> 10.0.0.3 && outport == "lr0-public" && is_chassis_resident("cr-lr0-public")
> && (!ct.trk || !ct.rpl) && reg9[[4]] == 1), action=(reg9[[4]] = 0;
> ct_snat(172.168.0.20);)
> ])
>
> # Separate zones for DGP
> @@ -5548,9 +5548,9 @@ AT_CHECK([grep "lr_out_post_undnat" lr0flows | sed
> 's/table=./table=?/' | sort],
> AT_CHECK([grep "lr_out_snat" lr0flows | sed 's/table=./table=?/' | sort],
> [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=153 , match=(ip && ip4.src ==
> 10.0.0.0/24 && outport == "lr0-public" &&
> is_chassis_resident("cr-lr0-public")), action=(ct_snat(172.168.0.10);)
> - table=? (lr_out_snat ), priority=161 , match=(ip && ip4.src ==
> 10.0.0.10 && outport == "lr0-public" &&
> is_chassis_resident("cr-lr0-public")), action=(ct_snat(172.168.0.30);)
> - table=? (lr_out_snat ), priority=161 , match=(ip && ip4.src ==
> 10.0.0.3 && outport == "lr0-public" && is_chassis_resident("cr-lr0-public")),
> action=(ct_snat(172.168.0.20);)
> + table=? (lr_out_snat ), priority=153 , match=(ip && ip4.src ==
> 10.0.0.0/24 && outport == "lr0-public" &&
> is_chassis_resident("cr-lr0-public") && (!ct.trk || !ct.rpl)),
> action=(ct_snat(172.168.0.10);)
> + table=? (lr_out_snat ), priority=161 , match=(ip && ip4.src ==
> 10.0.0.10 && outport == "lr0-public" && is_chassis_resident("cr-lr0-public")
> && (!ct.trk || !ct.rpl)), action=(ct_snat(172.168.0.30);)
> + table=? (lr_out_snat ), priority=161 , match=(ip && ip4.src ==
> 10.0.0.3 && outport == "lr0-public" && is_chassis_resident("cr-lr0-public")
> && (!ct.trk || !ct.rpl)), action=(ct_snat(172.168.0.20);)
> ])
>
> # Make the logical router as Gateway router
> @@ -7340,9 +7340,9 @@ AT_CHECK([grep lr_in_unsnat lrflows | grep ct_snat |
> sed 's/table=../table=??/'
> ])
>
> AT_CHECK([grep lr_out_snat lrflows | grep ct_snat | sed
> 's/table=../table=??/' | sort], [0], [dnl
> - table=??(lr_out_snat ), priority=161 , match=(ip && ip4.src ==
> 20.0.0.10 && outport == "DR-S1" && is_chassis_resident("cr-DR-S1")),
> action=(ct_snat(172.16.1.10);)
> - table=??(lr_out_snat ), priority=161 , match=(ip && ip4.src ==
> 20.0.0.10 && outport == "DR-S2" && is_chassis_resident("cr-DR-S2")),
> action=(ct_snat(10.0.0.10);)
> - table=??(lr_out_snat ), priority=161 , match=(ip && ip4.src ==
> 20.0.0.10 && outport == "DR-S3" && is_chassis_resident("cr-DR-S3")),
> action=(ct_snat(192.168.0.10);)
> + table=??(lr_out_snat ), priority=161 , match=(ip && ip4.src ==
> 20.0.0.10 && outport == "DR-S1" && is_chassis_resident("cr-DR-S1") &&
> (!ct.trk || !ct.rpl)), action=(ct_snat(172.16.1.10);)
> + table=??(lr_out_snat ), priority=161 , match=(ip && ip4.src ==
> 20.0.0.10 && outport == "DR-S2" && is_chassis_resident("cr-DR-S2") &&
> (!ct.trk || !ct.rpl)), action=(ct_snat(10.0.0.10);)
> + table=??(lr_out_snat ), priority=161 , match=(ip && ip4.src ==
> 20.0.0.10 && outport == "DR-S3" && is_chassis_resident("cr-DR-S3") &&
> (!ct.trk || !ct.rpl)), action=(ct_snat(192.168.0.10);)
> ])
>
> check ovn-nbctl --wait=sb lr-nat-del DR snat 20.0.0.10
> @@ -7416,9 +7416,9 @@ AT_CHECK([grep lr_in_unsnat lrflows | grep ct_snat |
> sed 's/table=../table=??/'
> ])
>
> AT_CHECK([grep lr_out_snat lrflows | grep ct_snat | sed
> 's/table=../table=??/' | sort], [0], [dnl
> - table=??(lr_out_snat ), priority=161 , match=(ip && ip4.src ==
> 20.0.0.10 && outport == "DR-S1" && is_chassis_resident("cr-DR-S1")),
> action=(ct_snat(172.16.1.10);)
> - table=??(lr_out_snat ), priority=161 , match=(ip && ip4.src ==
> 20.0.0.10 && outport == "DR-S2" && is_chassis_resident("cr-DR-S2")),
> action=(ct_snat(10.0.0.10);)
> - table=??(lr_out_snat ), priority=161 , match=(ip && ip4.src ==
> 20.0.0.10 && outport == "DR-S3" && is_chassis_resident("cr-DR-S3")),
> action=(ct_snat(192.168.0.10);)
> + table=??(lr_out_snat ), priority=161 , match=(ip && ip4.src ==
> 20.0.0.10 && outport == "DR-S1" && is_chassis_resident("cr-DR-S1") &&
> (!ct.trk || !ct.rpl)), action=(ct_snat(172.16.1.10);)
> + table=??(lr_out_snat ), priority=161 , match=(ip && ip4.src ==
> 20.0.0.10 && outport == "DR-S2" && is_chassis_resident("cr-DR-S2") &&
> (!ct.trk || !ct.rpl)), action=(ct_snat(10.0.0.10);)
> + table=??(lr_out_snat ), priority=161 , match=(ip && ip4.src ==
> 20.0.0.10 && outport == "DR-S3" && is_chassis_resident("cr-DR-S3") &&
> (!ct.trk || !ct.rpl)), action=(ct_snat(192.168.0.10);)
> ])
>
> AT_CHECK([grep lr_in_dnat lrflows | grep ct_dnat | sed
> 's/table=../table=??/' | sort], [0], [dnl
> diff --git a/tests/ovn.at b/tests/ovn.at
> index 2576a659b..79c729bc6 100644
> --- a/tests/ovn.at
> +++ b/tests/ovn.at
> @@ -34453,7 +34453,7 @@ dnat_zone=$(ovs-ofctl dump-flows br-int
> table=$DNAT_TABLE,metadata=0x${lr0_dp_ke
> if test -n "$dnat_zone"; then
> dnat_zone=${dnat_zone::-1}
> fi
> -snat_zone=$(ovs-ofctl dump-flows br-int
> table=$SNAT_TABLE,metadata=0x${lr0_dp_key} | grep priority=153 | grep -o
> zone=.*, | cut -d '=' -f 2)
> +snat_zone=$(ovs-ofctl dump-flows br-int
> table=$SNAT_TABLE,metadata=0x${lr0_dp_key} | grep priority=153 | grep
> ct_state=-trk | grep -o zone=.*, | cut -d '=' -f 2)
> if test -n "$snat_zone"; then
> snat_zone=${snat_zone::-1}
> fi
> @@ -34470,7 +34470,7 @@ dnat_zone=$(ovs-ofctl dump-flows br-int
> table=$DNAT_TABLE,metadata=0x${lr0_dp_ke
> if test -n "$dnat_zone"; then
> dnat_zone=${dnat_zone::-1}
> fi
> -snat_zone=$(ovs-ofctl dump-flows br-int
> table=$SNAT_TABLE,metadata=0x${lr0_dp_key} | grep priority=153 | grep -o
> zone=.*, | cut -d '=' -f 2)
> +snat_zone=$(ovs-ofctl dump-flows br-int
> table=$SNAT_TABLE,metadata=0x${lr0_dp_key} | grep priority=153 | grep
> ct_state=-trk | grep -o zone=.*, | cut -d '=' -f 2)
> if test -n "$snat_zone"; then
> snat_zone=${snat_zone::-1}
> fi
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