Hi, I am using OVS2.0.1 and GRE tunnels for transport. I am trying to send jumbo frames from guest VM, so I changed MTU of VM's eth0, OVS interface br0, vport interface to the VM, and also host's eth0 to 9000. But I cannot change MTU of br-int with command ifconfig br-int mtu 9000.
The results is that ping destination outside of the hypervisor with packet size larger than 1472 fails. tcpdump -i br0 captures truncated packets: ... GREv0, key=0xb5515, seq 9400832, length 1480: IP truncated-ip - 54 bytes missing! 11.11.11.4 > 11.11.11.2: ICMP echo request, id 1416, seq 3044, length 1488 My questions are: 1. In which step of OVS processing the packet is truncated? 2. What should be the right steps to enable jumbo frames sending for VMs? 3. Why can't I change br-int MTU while br0 can be changed? Thanks guys! Han _______________________________________________ discuss mailing list [email protected] http://openvswitch.org/mailman/listinfo/discuss
