This is an automatically-generated clone of issue https://bugzilla.redhat.com/show_bug.cgi?id=2126083
reproduced on version: ovn22.09-22.09.0-46.el9fdp.x86_64 ovn22.09-central-22.09.0-46.el9fdp.x86_64 ovn22.09-host-22.09.0-46.el9fdp.x86_64 and verified on version: ovn22.12-22.12.0-20.el9fdp.x86_64 ovn22.12-central-22.12.0-20.el9fdp.x86_64 ovn22.12-host-22.12.0-20.el9fdp.x86_64 topo as below: system1 system2 server0-------ls1----------lr1-----public------------br-ext------------br-ext--------pulic-----------lr2---------ls2--------client and set LB on lr1(enabled reject=true), dnat and snat on lr2. and set mtu=500 on lr2. I start connection between server and client, send big packet to client. then I can see lr2 send icmp unreachable packets to lb vip. on old version: big packets not pass on fixed version: big packets pass