On 10/27/2013 11:20 PM, Yoav Nir wrote:
I guess the idea is that if the packet is still bigger than the PMTU,
then the IKE host gets back a "fragmentation needed" ICMP, and the IKE
daemon learns of that and resends packets with appropriately small size.

There are some issues with this:

You proceed to describe how PMTUD works, but this is intended (AFAICT) to be more like PLMUTD - which does not rely on ICMPs.

Joe

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