[Openstack] [openstack][ipv6] IPV6 fragmentation

Ajay Kalambur (akalambu) akalambu at cisco.com
Wed Feb 18 22:11:28 UTC 2015

I have an Openstack OVS/VXLAN setup with MTU of 1400.  I have 2 Vms running on 2 different compute nodes
With ipv4 I am able to perform a ping with packet size of 1500  which is above the MTU and it works as fragmentation happens

Now with ipv6 I try the same test

ubuntu at testclient1:~$ ping6 -c10 -s 1500 2001:45::f816:3eff:fea2:d1b5

PING 2001:45::f816:3eff:fea2:d1b5(2001:45::f816:3eff:fea2:d1b5) 1500 data bytes


And the ping fails. I wanted to do this since I had a UDP performance test with 8K packet size and noticed that packets were not going through

So how does one deal with larger packets above MTU size on these ipv6 tenant networks


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