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[QUANTUM] (Bug ?) L3 routing not correctly fragmenting packets ?



I recently observed a strange behaviour with L3 Quantum routing (Openvswitch setup with Provider Router). A simple curl to an external website is sometimes failing due to packet size : > X.X.X.X: ICMP unreachable - need to frag (mtu 1454), length 556 IP (tos 0x0, ttl 48, id 25918, offset 0, flags [DF], proto TCP (6), length 1500)

Only changing the VM MTU to 1454 does the trick ('ifconfig eth0 mtu 1454').

For info, is the floating IP bound to (private IP).

I can't provide the URL for reproducing, as the external website is actually an external corporate webservice.
Do you have any idea on what could be the root cause, and how to fix it ?


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