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Re: jumbo frames
From: "Richard A. Steenbergen" <ras () e-gerbil net>
Date: Wed, 30 May 2001 18:05:15 -0400 (EDT)


On Wed, 30 May 2001, Wayne Bouchard wrote:

Well, the way it oughta work is that the backbone uses the same MTU as
that of the largest MTU of your endpoints. So, for example, you have a
buncha hosts on a fddi ring running at 4470, you want to make sure
those frames don't have to get fragmented inside your network. Idealy,
all hosts have the same MTU and no one has to worry about that, but in
practice, it seems to be better to push the fragmentation as close to
the end user as possible. (That is, if a user on a 1500MTU link makes
a request to a host on a 4470 link, the response is 4470 up until the
user's end network.) Of course, path MTU discovery makes this a moot
point. The conversation will be held in 1500 byte fragments.

Fortunantly hosts on FDDI rings are rare these days, but I'd love to see a
modern analysis of the packet sizes going through the internet (everything
I've seen comes from the days when FDDI roamed the earth).


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