On Tue, May 9, 2017 at 5:42 PM, Fredrik Markström <fredrik.markstrom@xxxxxxxxx> wrote: > > Maybe I was unclear, the veth implementation drops all packers larger then the > configured MTU (on the receiving interface). > Most ethernet drivers accepts packets up to the ethernet MTU no matter the > configured MTU. As far as I can tell from the RFC:s that is ok. This is because IP layer does the fragmentation for you. But some drivers, for example tg3, drop packet larger than its dev->mtu very early too. > > A simpler solution would be to only drop packets larger then ethernet MTU (like > most network drivers), but I guess that will break existing stuff > already out there. I wonder why did we introduce that mtu check for veth when IP layer could either fragment or reject with ICMP?
