On 11 July 2016 at 11:49, Sean M. Collins <s...@coreitpro.com> wrote:
> Sam Yaple wrote: > > In this situation, since you are mapping real-ips and the real world runs > > on 1500 mtu > > Don't be so certain about that assumption. The Internet is a very big > and diverse place.... OK, I'll contradict myself now - the original question wasn't L2 transit. Never mind. That 'inter' bit is actually rather important. MTU applies to a layer 2 domain, and routing is designed such that the MTUs on the two ports of a router are irrelevant to each other. What the world does has no bearing on the MTU I want on my L2 domain, and so Sam's point - 'I must choose the MTU other people use' - is simply invalid. You might reasonably want your Neutron router to have an external MTU of 1500, though, to do what he asks in the face of some thoughtful soul filtering out PMTU exceeded messages. I still think it comes back to the same thing as I suggested in my other mail.
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