Ran couple of tests to see what happens when MTU of overlay interfaces
1. One end at MTU 8950 and the other at MTU 1450 . In this case the
veth peer connecting the MTU 1450 interface to the overlay bridge has
MTU of 8950. Ping from the MTU 8950 side.
ping -s 8900 <mtu1450h> -fails
2. Set the veth peer MTU to 1450 .
ping -s 8900 <mtu1450h> -works
I think "docker exec" should allow setting the MTU of the overlay
interface and if the peer veth 's MTU is also made the same ( and
provided PMTU is set correctly, /proc/sys/net/ipv4/ip_no_pmtu_disc is
not 1 ) everything should work .
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