Comment 7 for bug 1442257

Adding a relvant comment received from Xiang Hui (xianghui):
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I am curious about why the corosync packets are fragmented for the default mtu 1500 with IPv4 first.

Here just a guess, link [1] may explained fragment and reassembly corosync packets did break the cluster due to the fact corosync is using Totem protocol which implemented by using a consistent order for all the messages sent or received to the members in a single ring to communicate, so if fragmentation happened it will break the goal of Totem rule.

[1] The Totem Single-Ring Ordering and Membership Protocol
http://www.cs.jhu.edu/~yairamir/archive.html