Comment 6 for bug 2032817

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Brian Haley (brian-haley) wrote : Re: OVN: Distributed FIP packet drops when provider network MTU exceeds tenant network MTU

So the difference seems to be OVN doesn't handle the DF bit, something else for the gap document.

Jens - in the OVS case did it generate a packet to big, install a route, then stop fragmenting? Or did the OVS router actually fragment? Just wanted to make sure we document it right.

The reason I asked about the protocol is that UDP (and IP) isn't guaranteed to work when the MTU changes like this, it's technically up to the user to do path MTU discovery, detect the failure and backoff [0]. Not saying we shouldn't try to address the issue...

[0] https://datatracker.ietf.org/doc/html/rfc5405#section-3.2