[libvirt] [RFC PATCH] set tap mtu

Herbert Xu herbert.xu at redhat.com
Tue Nov 18 21:30:20 UTC 2008

On Tue, Nov 18, 2008 at 03:16:14PM +0000, Mark McLoughlin wrote:
> My take on it is that it needs to be an opt in thing - if path MTU
> discovery was sufficient to deal with all cases then we'd probably have
> an mtu > 1500 everywhere ... Herbert?

PMTU often breaks due to firewalls.  Also even if you have did
a large MTU it is only effective if the entire path supports it.
So for most peers you'll be using an MTU of 1500 or less.

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