> On 17 Sep 2020, at 19:29, Venkat <venkat.dabb...@gmail.com> wrote:
>
>
> Andrew,
>
> I have a few follow up questions on the stated behavior.
>
> 1. Does the behavior you outlined about hitting special-case "-1" entries
> apply to UDP traffic as well if the ACL rule is stateful?
Yup.
>
> 2. What happens when ACL config is modified while traffic is flowing? Would
> the packets continue to hit the special-case "-1" session until the session
> is timed out and re-claimed? If that's true, then packets would continue to
> sneak through even when a user modifies the ACL from Permit+Reflect to Deny.
Yep. You can look at the code, there is a debug CLI tweak to reclassify
sessions, but I am not sure anyone actually uses it.
There is no “always right” answer to this ~20 year old question.
ACL plugin is very explicitly not a “fancy firewall”.
>
> 3. And regarding the special-case "-1" lookups, I assume a stateful ACL hit
> would result in the creation of such a session and subsequent packets would
> by-pass ACL rules and continue to be served by special-case "-1".
...as your have observed it. The return packets on that interface matching the
same five tuple, too.
—a
>
>
> thanks
> Venkat
>
>
>> On Tue, Sep 15, 2020 at 2:01 AM Andrew 👽 Yourtchenko <ayour...@gmail.com>
>> wrote:
>> Hi Venkat,
>>
>> Before doing ACL checks, acl-plugin checks the establshed sessions on
>> the given interface.
>>
>> If an already established session is hit the action is set to "3" and
>> no further ACL check is done, which is what you see in your output.
>>
>> For that case, the ACL# in the trace is a special-case "-1", same as
>> lc_index-1 - because we actually never get it to ACL lookup so do not
>> need it; and the rule# is the session index; and the trace_bits tells
>> us that this session is classifed to use timeout type "3", which is
>> defined in acl_timeout_e as "ACL_TIMEOUT_TCP_TRANSIENT" - which makes
>> sense, since you are sending the packets in one direction and thus the
>> session never establishes and the timeout type never changes to
>> "TCP_IDLE".
>>
>> Of the packets you sent in total, 15002 packets had hit the ACL#3
>> rule and caused the sessions to be created. The rest of the packets
>> had hit the established session entries and this is one of those that
>> you have captured.
>>
>> At the time of taking the outputs the traffic was stopped and the
>> sessions were deleted by idle timeout (which for the transient state
>> is short).
>>
>> Does this make sense ?
>>
>> --a
>>
>>
>>
>>
>> On 9/14/20, Venkat <venkat.dabb...@gmail.com> wrote:
>> > Hello Andrew,
>> >
>> > I am doing a simple test by sending TCP flows from Trex traffic generator.
>> > Traffic source is 16.0.0.1-16.0.0.100 and destination is
>> > 48.0.0.1-48.0.0.100.
>> > I am sending TCP traffic with CPS=50 from 100 clients to 100 servers via
>> > Trex http profile.
>> >
>> > I have a reflective ACL to permit the flow for the above src and dst.
>> > I expect the packet to hit acl index 3 rule 0 and get permitted.
>> > However, I see the following match in the packet trace which doesn't seem
>> > like it is hitting acl index 3 and rule 0 but hitting some other acl index
>> > (acl -1 and lc_index -1).
>> > What is the behavior here? Please provide some context here..
>> >
>> > 03:47:03:874624: acl-plugin-in-ip4-fa
>> >
>> > acl-plugin: lc_index: -1, sw_if_index 1, next index 1, action: 3, match:
>> > acl
>> > -1 rule 13309 trace_bits 80010303
>> >
>> > pkt info 0000000000000000 0000000000000000 0000000000000000
>> > 4300003043000010
>> > 0001010600502d14 0310ffff00000000
>> >
>> > lc_index 0 l3 ip4 16.0.0.67 -> 48.0.0.67 l4 lsb_of_sw_if_index 1 proto 6
>> > l4_is_input 1 l4_slow_path 0 l4_flags 0x01 port 11540 -> 80 tcp flags
>> > (valid) 10 rsvd 0
>> >
>> > DBGvpp# show acl-plugin acl
>> >
>> > acl-index 0 count 2 tag
>> > {99998-sra-inbound-sasefwpro-nags-explicit-deny-99998}
>> >
>> > 0: ipv4 deny src 0.0.0.0/0 dst 0.0.0.0/0 proto 0 sport 0 dport 0
>> >
>> > 1: ipv6 deny src ::/0 dst ::/0 proto 0 sport 0 dport 0
>> >
>> > applied inbound on sw_if_index: 1
>> >
>> > applied outbound on sw_if_index:
>> >
>> > used in lookup context index: 1
>> >
>> > acl-index 1 count 6 tag
>> > {99999-sra-inbound-sasefwpro-sase-default-fw-profile}
>> >
>> > 0: ipv4 permit+reflect src 0.0.0.0/0 dst 0.0.0.0/0 proto 6 sport 0-65535
>> > dport 0-65535
>> >
>> > 1: ipv6 permit+reflect src ::/0 dst ::/0 proto 6 sport 0-65535 dport
>> > 0-65535
>> >
>> > 2: ipv4 permit+reflect src 0.0.0.0/0 dst 0.0.0.0/0 proto 17 sport 0-65535
>> > dport 0-65535
>> >
>> > 3: ipv6 permit+reflect src ::/0 dst ::/0 proto 17 sport 0-65535 dport
>> > 0-65535
>> >
>> > 4: ipv4 permit+reflect src 0.0.0.0/0 dst 0.0.0.0/0 proto 1 sport 0-65535
>> > dport 0-65535
>> >
>> > 5: ipv4 permit+reflect src 0.0.0.0/0 dst 0.0.0.0/0 proto 1 sport 0-65535
>> > dport 0-65535
>> >
>> > applied inbound on sw_if_index: 1
>> >
>> > applied outbound on sw_if_index:
>> >
>> > used in lookup context index: 1
>> >
>> > acl-index 2 count 6 tag
>> > {99999-sra-outbound-sasefwpro-sase-default-fw-profile}
>> >
>> > 0: ipv4 deny src 0.0.0.0/0 dst 0.0.0.0/0 proto 6 sport 0-65535 dport
>> > 0-65535
>> >
>> > 1: ipv6 deny src ::/0 dst ::/0 proto 6 sport 0-65535 dport 0-65535
>> >
>> > 2: ipv4 deny src 0.0.0.0/0 dst 0.0.0.0/0 proto 17 sport 0-65535 dport
>> > 0-65535
>> >
>> > 3: ipv6 deny src ::/0 dst ::/0 proto 17 sport 0-65535 dport 0-65535
>> >
>> > 4: ipv4 deny src 0.0.0.0/0 dst 0.0.0.0/0 proto 1 sport 0-65535 dport
>> > 0-65535
>> >
>> > 5: ipv4 deny src 0.0.0.0/0 dst 0.0.0.0/0 proto 1 sport 0-65535 dport
>> > 0-65535
>> >
>> > applied inbound on sw_if_index:
>> >
>> > applied outbound on sw_if_index: 1
>> >
>> > used in lookup context index: 0
>> >
>> > acl-index 3 count 1 tag {100-allow-48}
>> >
>> > 0: ipv4 permit+reflect src 16.0.0.0/16 dst 48.0.0.0/16 proto 0 sport 0
>> > dport
>> > 0
>> >
>> > applied inbound on sw_if_index: 1
>> >
>> > used in lookup context index: 1
>> >
>> > DBGvpp#
>> >
>> > DBGvpp# show acl-plugin tables
>> >
>> > Stats counters enabled for interface ACLs: 0
>> >
>> > Mask-type entries:
>> >
>> > 0: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
>> > 0000000000000000 0800ffffffffffff refcount 4
>> >
>> > 1: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
>> > 000000ff00000000 0e00ffffffffffff refcount 24
>> >
>> > 2: 0000000000000000 0000000000000000 0000000000000000 0000ffff0000ffff
>> > 0000000000000000 0800ffffffffffff refcount 2
>> >
>> > Mask-ready ACL representations
>> >
>> > acl-index 0 bitmask-ready layout
>> >
>> > applied lc_index list: 1
>> >
>> > 0: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
>> > 0000000000000000 0000000000000000 base mask index 0 acl 0 rule 0 action 0
>> >
>> > 1: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
>> > 0000000000000000 0800000000000000 base mask index 0 acl 0 rule 1 action 0
>> >
>> > acl-index 1 bitmask-ready layout
>> >
>> > applied lc_index list: 1
>> >
>> > 0: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
>> > 0000000600000000 0200000100000000 base mask index 1 acl 1 rule 0 action 2
>> >
>> > 1: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
>> > 0000000600000000 0a00000100000000 base mask index 1 acl 1 rule 1 action 2
>> >
>> > 2: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
>> > 0000001100000000 0200000100000000 base mask index 1 acl 1 rule 2 action 2
>> >
>> > 3: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
>> > 0000001100000000 0a00000100000000 base mask index 1 acl 1 rule 3 action 2
>> >
>> > 4: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
>> > 0000000100000000 0200000100000000 base mask index 1 acl 1 rule 4 action 2
>> >
>> > 5: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
>> > 0000000100000000 0200000100000000 base mask index 1 acl 1 rule 5 action 2
>> >
>> > acl-index 2 bitmask-ready layout
>> >
>> > applied lc_index list: 0
>> >
>> > 0: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
>> > 0000000600000000 0200000100000000 base mask index 1 acl 2 rule 0 action 0
>> >
>> > 1: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
>> > 0000000600000000 0a00000100000000 base mask index 1 acl 2 rule 1 action 0
>> >
>> > 2: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
>> > 0000001100000000 0200000100000000 base mask index 1 acl 2 rule 2 action 0
>> >
>> > 3: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
>> > 0000001100000000 0a00000100000000 base mask index 1 acl 2 rule 3 action 0
>> >
>> > 4: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
>> > 0000000100000000 0200000100000000 base mask index 1 acl 2 rule 4 action 0
>> >
>> > 5: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
>> > 0000000100000000 0200000100000000 base mask index 1 acl 2 rule 5 action 0
>> >
>> > acl-index 3 bitmask-ready layout
>> >
>> > applied lc_index list: 1
>> >
>> > 0: 0000000000000000 0000000000000000 0000000000000000 0000003000000010
>> > 0000000000000000 0000000200000000 base mask index 2 acl 3 rule 0 action 2
>> >
>> > Applied lookup entries for lookup contexts
>> >
>> > lc_index 0:
>> >
>> > applied acls: 2
>> >
>> > applied mask info entries:
>> >
>> > 0: mask type index 1 first rule index 0 num_entries 6 max_collisions 2
>> >
>> > lookup applied entries:
>> >
>> > 0: acl 2 rule 0 action 0 bitmask-ready rule 0 mask type index: 1
>> > colliding_rules: 1 collision_head_ae_idx 0 hitcount 0 acl_pos: 0
>> >
>> > 0: acl 2 ace 0 acl pos 0 pae index: 0
>> >
>> > 1: acl 2 rule 1 action 0 bitmask-ready rule 1 mask type index: 1
>> > colliding_rules: 1 collision_head_ae_idx 1 hitcount 0 acl_pos: 0
>> >
>> > 0: acl 2 ace 1 acl pos 0 pae index: 1
>> >
>> > 2: acl 2 rule 2 action 0 bitmask-ready rule 2 mask type index: 1
>> > colliding_rules: 1 collision_head_ae_idx 2 hitcount 0 acl_pos: 0
>> >
>> > 0: acl 2 ace 2 acl pos 0 pae index: 2
>> >
>> > 3: acl 2 rule 3 action 0 bitmask-ready rule 3 mask type index: 1
>> > colliding_rules: 1 collision_head_ae_idx 3 hitcount 0 acl_pos: 0
>> >
>> > 0: acl 2 ace 3 acl pos 0 pae index: 3
>> >
>> > 4: acl 2 rule 4 action 0 bitmask-ready rule 4 mask type index: 1
>> > colliding_rules: 2 collision_head_ae_idx 4 hitcount 0 acl_pos: 0
>> >
>> > 0: acl 2 ace 4 acl pos 0 pae index: 4
>> >
>> > 1: acl 2 ace 5 acl pos 0 pae index: 5
>> >
>> > 5: acl 2 rule 5 action 0 bitmask-ready rule 5 mask type index: 1
>> > colliding_rules: 0 collision_head_ae_idx 4 hitcount 0 acl_pos: 0
>> >
>> > lc_index 1:
>> >
>> > applied acls: 3, 0, 1
>> >
>> > applied mask info entries:
>> >
>> > 0: mask type index 2 first rule index 0 num_entries 1 max_collisions 1
>> >
>> > 1: mask type index 0 first rule index 1 num_entries 2 max_collisions 1
>> >
>> > 2: mask type index 1 first rule index 3 num_entries 6 max_collisions 2
>> >
>> > lookup applied entries:
>> >
>> > 0: acl 3 rule 0 action 2 bitmask-ready rule 0 mask type index: 2
>> > colliding_rules: 1 collision_head_ae_idx 0 hitcount 150001 acl_pos: 0
>> >
>> > 0: acl 3 ace 0 acl pos 0 pae index: 0
>> >
>> > 1: acl 0 rule 0 action 0 bitmask-ready rule 0 mask type index: 0
>> > colliding_rules: 1 collision_head_ae_idx 1 hitcount 0 acl_pos: 1
>> >
>> > 0: acl 0 ace 0 acl pos 1 pae index: 1
>> >
>> > 2: acl 0 rule 1 action 0 bitmask-ready rule 1 mask type index: 0
>> > colliding_rules: 1 collision_head_ae_idx 2 hitcount 0 acl_pos: 1
>> >
>> > 0: acl 0 ace 1 acl pos 1 pae index: 2
>> >
>> > 3: acl 1 rule 0 action 2 bitmask-ready rule 0 mask type index: 1
>> > colliding_rules: 1 collision_head_ae_idx 3 hitcount 0 acl_pos: 2
>> >
>> > 0: acl 1 ace 0 acl pos 2 pae index: 3
>> >
>> > 4: acl 1 rule 1 action 2 bitmask-ready rule 1 mask type index: 1
>> > colliding_rules: 1 collision_head_ae_idx 4 hitcount 0 acl_pos: 2
>> >
>> > 0: acl 1 ace 1 acl pos 2 pae index: 4
>> >
>> > 5: acl 1 rule 2 action 2 bitmask-ready rule 2 mask type index: 1
>> > colliding_rules: 1 collision_head_ae_idx 5 hitcount 0 acl_pos: 2
>> >
>> > 0: acl 1 ace 2 acl pos 2 pae index: 5
>> >
>> > 6: acl 1 rule 3 action 2 bitmask-ready rule 3 mask type index: 1
>> > colliding_rules: 1 collision_head_ae_idx 6 hitcount 0 acl_pos: 2
>> >
>> > 0: acl 1 ace 3 acl pos 2 pae index: 6
>> >
>> > 7: acl 1 rule 4 action 2 bitmask-ready rule 4 mask type index: 1
>> > colliding_rules: 2 collision_head_ae_idx 7 hitcount 0 acl_pos: 2
>> >
>> > 0: acl 1 ace 4 acl pos 2 pae index: 7
>> >
>> > 1: acl 1 ace 5 acl pos 2 pae index: 8
>> >
>> > 8: acl 1 rule 5 action 2 bitmask-ready rule 5 mask type index: 1
>> > colliding_rules: 0 collision_head_ae_idx 7 hitcount 0 acl_pos: 2
>> >
>> > ACL lookup hash table:
>> >
>> > Hash table ACL plugin rule lookup bihash
>> >
>> > 13 active elements 13 active buckets
>> >
>> > 1 free lists
>> >
>> > 0 linear search buckets
>> >
>> > arena: base 7f7377ff0000, next 80d00
>> >
>> > used 527616 b (0 Mbytes) of 67108864 b (64 Mbytes)
>> >
>> > DBGvpp# show acl-plugin sessions
>> >
>> > Sessions total: add 150002 - del 150002 = 0
>> >
>> > Sessions active: add 150002 - deact 150002 = 0
>> >
>> > Sessions being purged: deact 150002 - del 150002 = 0
>> >
>> > now: 38259162493998 clocks per second: 2500000000
>> >
>> > Per-thread data:
>> >
>> > Thread #0:
>> >
>> > connection add/del stats:
>> >
>> > sw_if_index 0: add 0 - del 0 = 0; epoch chg: 0
>> >
>> > sw_if_index 1: add 150002 - del 150002 = 0; epoch chg: 0
>> >
>> > sw_if_index 2: add 0 - del 0 = 0; epoch chg: 0
>> >
>> > sw_if_index 3: add 0 - del 0 = 0; epoch chg: 0
>> >
>> > sw_if_index 4: add 0 - del 0 = 0; epoch chg: 0
>> >
>> > sw_if_index 5: add 0 - del 0 = 0; epoch chg: 0
>> >
>> > sw_if_index 6: add 0 - del 0 = 0; epoch chg: 0
>> >
>> > sw_if_index 7: add 0 - del 0 = 0; epoch chg: 0
>> >
>> > sw_if_index 8: add 0 - del 0 = 0; epoch chg: 0
>> >
>> > sw_if_index 9: add 0 - del 0 = 0; epoch chg: 0
>> >
>> > connection timeout type lists:
>> >
>> > fa_conn_list_head[0]: -1
>> >
>> > fa_conn_list_head[1]: -1
>> >
>> > fa_conn_list_head[2]: -1
>> >
>> > fa_conn_list_head[3]: -1
>> >
>> > fa_conn_list_head[4]: -1
>> >
>> > Next expiry time: 0
>> >
>> > Requeue until time: 0
>> >
>> > Current time wait interval: 0
>> >
>> > Count of deleted sessions: 150002
>> >
>> > Delete already deleted: 0
>> >
>> > Session timers restarted: 150750
>> >
>> > Swipe until this time: 0
>> >
>> > sw_if_index serviced bitmap: 2
>> >
>> > pending clear intfc bitmap :
>> >
>> > clear in progress: 0
>> >
>> > interrupt is pending: 0
>> >
>> > interrupt is needed: 0
>> >
>> > interrupt is unwanted: 0
>> >
>> > interrupt generation: 14572
>> >
>> > received session change requests: 0
>> >
>> > sent session change requests: 0
>> >
>> > Conn cleaner thread counters:
>> >
>> > 33: delete_by_sw_index events
>> >
>> > 30: delete_by_sw_index handled ok
>> >
>> > 0: unknown events received
>> >
>> > 0: session idle timers restarted
>> >
>> > 14567: event wait with timeout called
>> >
>> > 5: event wait w/o timeout called
>> >
>> > 14571: total event cycles
>> >
>> > Interrupt generation: 14572
>> >
>> > Sessions per interval: min 1 max 100 increment: 100 ms current: 500 ms
>> >
>> > Reclassify sessions: 0
>> >
>> > IPv6 Session lookup hash table:
>> >
>> > Hash table ACL plugin FA IPv6 session bihash
>> >
>> > [empty, uninitialized]
>> >
>> > IPv4 Session lookup hash table:
>> >
>> > Hash table ACL plugin FA IPv4 session bihash
>> >
>> > 0 active elements 0 active buckets
>> >
>> > 5 free lists
>> >
>> > [len 1] 51199 free elts
>> >
>> > [len 2] 4504 free elts
>> >
>> > [len 4] 373 free elts
>> >
>> > [len 8] 9 free elts
>> >
>> > [len 16] 1 free elts
>> >
>> > 0 linear search buckets
>> >
>> > arena: base 7f5abb720000, next 7b84c0
>> >
>> > used 8094912 b (7 Mbytes) of 1073741824 b (1024 Mbytes)
>> >
>> > DBGvpp# show nat44 addresses
>> >
>> > NAT44 pool addresses:
>> >
>> > 172.24.114.39
>> >
>> > tenant VRF independent
>> >
>> > 0 busy udp ports
>> >
>> > 15001 busy tcp ports
>> >
>> > 0 busy icmp ports
>> >
>> > NAT44 twice-nat pool addresses:
>> >
>> > 10.40.1.254
>> >
>> > tenant VRF independent
>> >
>> > 0 busy udp ports
>> >
>> > 0 busy tcp ports
>> >
>> > 0 busy icmp ports
>> >
>> > DBGvpp#
>> >
>> > Packet 50
>> >
>> > 03:47:03:874592: dpdk-input
>> >
>> > lan-ens6 rx queue 0
>> >
>> > buffer 0x8b222: current data 0, length 54, buffer-pool 0, ref-count 1,
>> > totlen-nifb 0, trace handle 0x31
>> >
>> > ext-hdr-valid
>> >
>> > l4-cksum-computed l4-cksum-correct
>> >
>> > PKT MBUF: port 0, nb_segs 1, pkt_len 54
>> >
>> > buf_len 2176, data_len 54, ol_flags 0x0, data_off 128, phys_addr 0x6fec8900
>> >
>> > packet_type 0x110 l2_len 0 l3_len 0 outer_l2_len 0 outer_l3_len 0
>> >
>> > rss 0x3aa73aa7 fdir.hi 0x0 fdir.lo 0x3aa73aa7
>> >
>> > Packet Types
>> >
>> > RTE_PTYPE_L3_IPV4 (0x0010) IPv4 packet without extension headers
>> >
>> > RTE_PTYPE_L4_TCP (0x0100) TCP packet
>> >
>> > IP4: 02:85:36:20:e4:87 -> 02:2e:53:e6:4f:e1
>> >
>> > TCP: 16.0.0.67 -> 48.0.0.67
>> >
>> > tos 0x00, ttl 128, length 40, checksum 0x80f9
>> >
>> > fragment id 0x7951
>> >
>> > TCP: 11540 -> 80
>> >
>> > seq. 0x181a45db ack 0x181af226
>> >
>> > flags 0x10 ACK, tcp header: 20 bytes
>> >
>> > window 32768, checksum 0x59b4
>> >
>> > 03:47:03:874606: ethernet-input
>> >
>> > frame: flags 0x3, hw-if-index 1, sw-if-index 1
>> >
>> > IP4: 02:85:36:20:e4:87 -> 02:2e:53:e6:4f:e1
>> >
>> > 03:47:03:874620: ip4-input-no-checksum
>> >
>> > TCP: 16.0.0.67 -> 48.0.0.67
>> >
>> > tos 0x00, ttl 128, length 40, checksum 0x80f9
>> >
>> > fragment id 0x7951
>> >
>> > TCP: 11540 -> 80
>> >
>> > seq. 0x181a45db ack 0x181af226
>> >
>> > flags 0x10 ACK, tcp header: 20 bytes
>> >
>> > window 32768, checksum 0x59b4
>> >
>> > 03:47:03:874624: acl-plugin-in-ip4-fa
>> >
>> > acl-plugin: lc_index: -1, sw_if_index 1, next index 1, action: 3, match:
>> > acl
>> > -1 rule 13309 trace_bits 80010303
>> >
>> > pkt info 0000000000000000 0000000000000000 0000000000000000
>> > 4300003043000010
>> > 0001010600502d14 0310ffff00000000
>> >
>> > lc_index 0 l3 ip4 16.0.0.67 -> 48.0.0.67 l4 lsb_of_sw_if_index 1 proto 6
>> > l4_is_input 1 l4_slow_path 0 l4_flags 0x01 port 11540 -> 80 tcp flags
>> > (valid) 10 rsvd 0
>> >
>> > 03:47:03:874634: ip4-lookup
>> >
>> > fib 0 dpo-idx 53 flow hash: 0x00000000
>> >
>> > TCP: 16.0.0.67 -> 48.0.0.67
>> >
>> > tos 0x00, ttl 128, length 40, checksum 0x80f9
>> >
>> > fragment id 0x7951
>> >
>> > TCP: 11540 -> 80
>> >
>> > seq. 0x181a45db ack 0x181af226
>> >
>> > flags 0x10 ACK, tcp header: 20 bytes
>> >
>> > window 32768, checksum 0x59b4
>> >
>> > 03:47:03:874639: ip4-load-balance
>> >
>> > fib 0 dpo-idx 14 flow hash: 0x00000000
>> >
>> > TCP: 16.0.0.67 -> 48.0.0.67
>> >
>> > tos 0x00, ttl 128, length 40, checksum 0x80f9
>> >
>> > fragment id 0x7951
>> >
>> > TCP: 11540 -> 80
>> >
>> > seq. 0x181a45db ack 0x181af226
>> >
>> > flags 0x10 ACK, tcp header: 20 bytes
>> >
>> > window 32768, checksum 0x59b4
>> >
>> > 03:47:03:874655: ip4-rewrite
>> >
>> > tx_sw_if_index 2 dpo-idx 14 : ipv4 via 172.24.115.166 wan-ens7: mtu:9000
>> > 02fcbaad303302c6e54357a50800 flow hash: 0x00000000
>> >
>> > 00000000: 02fcbaad303302c6e54357a5080045000028795100007f0681f9100000433000
>> >
>> > 00000020: 00432d140050181a45db181af2265010800059b400002a2a2a2a2a2a
>> >
>> > 03:47:03:874660: nat44-ed-in2out-output
>> >
>> > NAT44_IN2OUT_ED_FAST_PATH: sw_if_index 1, next index 0, session 34066
>> >
>> > 03:47:03:874681: wan-ens7-output
>> >
>> > wan-ens7 l4-cksum-computed l4-cksum-correct natted l2_hdr_offset_valid
>> > l3_hdr_offset_valid
>> >
>> > IP4: 02:c6:e5:43:57:a5 -> 02:fc:ba:ad:30:33
>> >
>> > TCP: 172.24.114.39 -> 48.0.0.67
>> >
>> > tos 0x00, ttl 127, length 40, checksum 0x73fc
>> >
>> > fragment id 0x7951
>> >
>> > TCP: 8447 -> 80
>> >
>> > seq. 0x181a45db ack 0x181af226
>> >
>> > flags 0x10 ACK, tcp header: 20 bytes
>> >
>> > window 32768, checksum 0x57cc
>> >
>> > 03:47:03:874685: wan-ens7-tx
>> >
>> > wan-ens7 tx queue 0
>> >
>> > buffer 0x8b222: current data 0, length 54, buffer-pool 0, ref-count 1,
>> > totlen-nifb 0, trace handle 0x31
>> >
>> > ext-hdr-valid
>> >
>> > l4-cksum-computed l4-cksum-correct natted l2-hdr-offset 0 l3-hdr-offset 14
>> >
>> > PKT MBUF: port 0, nb_segs 1, pkt_len 54
>> >
>> > buf_len 2176, data_len 54, ol_flags 0x0, data_off 128, phys_addr 0x6fec8900
>> >
>> > packet_type 0x110 l2_len 0 l3_len 0 outer_l2_len 0 outer_l3_len 0
>> >
>> > rss 0x3aa73aa7 fdir.hi 0x0 fdir.lo 0x3aa73aa7
>> >
>> > Packet Types
>> >
>> > RTE_PTYPE_L3_IPV4 (0x0010) IPv4 packet without extension headers
>> >
>> > RTE_PTYPE_L4_TCP (0x0100) TCP packet
>> >
>> > IP4: 02:c6:e5:43:57:a5 -> 02:fc:ba:ad:30:33
>> >
>> > TCP: 172.24.114.39 -> 48.0.0.67
>> >
>> > tos 0x00, ttl 127, length 40, checksum 0x73fc
>> >
>> > fragment id 0x7951
>> >
>> > TCP: 8447 -> 80
>> >
>> > seq. 0x181a45db ack 0x181af226
>> >
>> > flags 0x10 ACK, tcp header: 20 bytes
>> >
>> > window 32768, checksum 0x57cc
>> >
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