[c-nsp] MPLS MTU / Jumbo frames etc.

[Gert Doering]

Hi,

On Wed, Jul 22, 2009 at 02:37:16PM -0400, Brandon Applegate wrote:
> >I'd bet that the linux box is not sending full-sized 9220 packets, but
> >fragmenting inside.
[..]
> Yes I have my MTU cranked up in linux and am doing all of this 
> intentionally as a test.  Unless tcpdump is lying to me, these are 
> unfragmented 9216-byte frames leaving and coming back with no 'complaints' 
> in sceneraio 3.

In that case, I don't know either.  You *should* indeed see ICMPs (or 
black holing) then.

I've just stumbled across the "I want to diagnose something in the network
and the test host is fragmenting behind my back" problem too often, so it
seemed quite likely...

gert
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Gert Doering - Munich, Germany                             gert at greenie.muc.de
fax: +49-89-35655025                        gert at net.informatik.tu-muenchen.de
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