Hi Yoav,
Yes, it says so in RFC 1122. Microsoft sends 576-byte packets when it does
IKEv1 fragmentation.
Actually, it is not a requirement in RFC1122, but only recommendation
(although a "strong" one):
"Since nearly all networks in the Internet currently
support an MTU of 576 or greater, we strongly recommend
the use of 576 for datagrams sent to non-local networks."
But I agree that 576 works in 90 or more percent of cases. And even 1280
will probably work for IPv4, but not so sure about it.
Valery.
Still, I don't think you're going to find on the modern Internet any
networks that aren't usable by IPv6.
So I think we should be pretty safe in adoption IPv6's minimum of 1280
Yoav
On Oct 17, 2013, at 9:34 PM, Mike Sullenberger (mls) <m...@cisco.com>
wrote:
> As I remember it IPv4 has a minimum packet size of 576 that won't (or at
> least shouldn't be) fragmented by IP.
>
> Mike.
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