[Bug 1967856] Re: Hairpin traffic does not work with centralized NAT gw
Frode Nordahl
1967856 at bugs.launchpad.net
Wed May 18 13:09:28 UTC 2022
** Changed in: ovn (Ubuntu)
Importance: High => Undecided
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https://bugs.launchpad.net/bugs/1967856
Title:
Hairpin traffic does not work with centralized NAT gw
Status in openvswitch package in Ubuntu:
Triaged
Status in ovn package in Ubuntu:
Invalid
Bug description:
If you have two hvs where hv1 is the gateway chassis and you have an
instance running on hv2.
On instance on hv2 hairpin traffic works for the first session, but
not for the next:
$ ping -c1 10.78.95.89
PING 10.78.95.89 (10.78.95.89) 56(84) bytes of data.
64 bytes from 10.78.95.89: icmp_seq=1 ttl=62 time=1.07 ms
--- 10.78.95.89 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 1.078/1.078/1.078/0.000 ms
$ sudo ovs-appctl -t ovs-vswitchd dpctl/dump-conntrack
icmp,orig=(src=10.78.95.89,dst=192.168.0.211,id=7334,type=8,code=0),reply=(src=192.168.0.211,dst=10.78.95.89,id=7334,type=0,code=0),zone=7
icmp,orig=(src=192.168.0.211,dst=10.78.95.89,id=7334,type=8,code=0),reply=(src=10.78.95.89,dst=192.168.0.211,id=7334,type=0,code=0),zone=7
$ ping -c1 10.78.95.89
PING 10.78.95.89 (10.78.95.89) 56(84) bytes of data.
--- 10.78.95.89 ping statistics ---
1 packets transmitted, 0 received, 100% packet loss, time 0ms
$ sudo ovs-appctl -t ovs-vswitchd dpctl/dump-conntrack
icmp,orig=(src=10.78.95.89,dst=192.168.0.211,id=7334,type=8,code=0),reply=(src=192.168.0.211,dst=10.78.95.89,id=7334,type=0,code=0),zone=7
icmp,orig=(src=192.168.0.211,dst=10.78.95.89,id=7334,type=8,code=0),reply=(src=10.78.95.89,dst=192.168.0.211,id=7334,type=0,code=0),zone=7
icmp,orig=(src=192.168.0.211,dst=10.78.95.89,id=7335,type=8,code=0),reply=(src=10.78.95.89,dst=192.168.0.211,id=7335,type=0,code=0),zone=7
We made an attempt at using OVN built with [0], but that did
unfortunately not help.
If we however revert [1] it works again:
$ ping -c1 10.78.95.89
PING 10.78.95.89 (10.78.95.89) 56(84) bytes of data.
64 bytes from 10.78.95.89: icmp_seq=1 ttl=62 time=1.31 ms
--- 10.78.95.89 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 1.318/1.318/1.318/0.000 ms
$ sudo ovs-appctl -t ovs-vswitchd dpctl/dump-conntrack
icmp,orig=(src=192.168.0.211,dst=10.78.95.89,id=7336,type=8,code=0),reply=(src=10.78.95.89,dst=192.168.0.211,id=7336,type=0,code=0),zone=7
icmp,orig=(src=10.78.95.89,dst=192.168.0.211,id=7336,type=8,code=0),reply=(src=192.168.0.211,dst=10.78.95.89,id=7336,type=0,code=0),zone=7
icmp,orig=(src=10.78.95.89,dst=192.168.0.211,id=7336,type=8,code=0),reply=(src=192.168.0.211,dst=10.78.95.89,id=7336,type=0,code=0),zone=1
$ ping -c1 10.78.95.89
PING 10.78.95.89 (10.78.95.89) 56(84) bytes of data.
64 bytes from 10.78.95.89: icmp_seq=1 ttl=62 time=0.307 ms
--- 10.78.95.89 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.307/0.307/0.307/0.000 ms
$ sudo ovs-appctl -t ovs-vswitchd dpctl/dump-conntrack
icmp,orig=(src=10.78.95.89,dst=192.168.0.211,id=7337,type=8,code=0),reply=(src=192.168.0.211,dst=10.78.95.89,id=7337,type=0,code=0),zone=7
icmp,orig=(src=10.78.95.89,dst=192.168.0.211,id=7337,type=8,code=0),reply=(src=192.168.0.211,dst=10.78.95.89,id=7337,type=0,code=0),zone=1
icmp,orig=(src=192.168.0.211,dst=10.78.95.89,id=7337,type=8,code=0),reply=(src=10.78.95.89,dst=192.168.0.211,id=7337,type=0,code=0),zone=7
icmp,orig=(src=192.168.0.211,dst=10.78.95.89,id=7336,type=8,code=0),reply=(src=10.78.95.89,dst=192.168.0.211,id=7336,type=0,code=0),zone=7
icmp,orig=(src=10.78.95.89,dst=192.168.0.211,id=7336,type=8,code=0),reply=(src=192.168.0.211,dst=10.78.95.89,id=7336,type=0,code=0),zone=7
icmp,orig=(src=10.78.95.89,dst=192.168.0.211,id=7336,type=8,code=0),reply=(src=192.168.0.211,dst=10.78.95.89,id=7336,type=0,code=0),zone=1
0: https://patchwork.ozlabs.org/project/ovn/patch/20220401175516.2139179-1-mmichels@redhat.com/
1: https://github.com/ovn-org/ovn/commit/4deac4509abbedd6ffaecf27eed01ddefccea40a
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