Thank you for raising this issue, so just to confirm, OVN 20.03 already does send ICMP type 3 (Destination Unreachable) code 4 (Fragmentation needed and DF was set) [4] to instances in the cloud, informing the client of the gateway MTU when the `gateway_mtu` flag is set on the LRP.
So the issue you are describing would only come into play if there are machines connected directly to the provider network using a MTU > the OVN LR MTU and/or a external to openstack router has MTU > the OVN LR MTU on its L3 interface facing the provider network? 4: https://github.com/ovn- org/ovn/commit/ba11e16288888be643b26c9cbe239eb5c1f4eb41 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1949120 Title: Missing PPMTUD for ICMP and UDP when there are dedicated gateways To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ovn/+bug/1949120/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
