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Date:      Tue, 20 Aug 2002 23:08:12 +0200
From:      Paul Everlund <tdv94ped@cs.umu.se>
To:        trevarthan@wingnet.net
Cc:        freebsd-questions@FreeBSD.ORG
Subject:   Re: MTU discovery
Message-ID:  <3D62AFBC.E065722E@cs.umu.se>
References:  <200208201616.53857.trevarthan@wingnet.net>

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Matthias Trevarthan wrote:
> 
> Howdy list,
> 
> How might I discover the MTU from my location to some arbitrary
> location on the internet?
> 
> Thanks!
> 
> Matthias Trevarthan

I have not very much knowledge on this particualr subject, but
I'll give it a try.

When finding the MTU I guess you will not always get the MTU size
at the destination, but the smallest MTU on the path to the desti-
nation.

If doing ping to a destination, specifying the packetsize, this
should probably determine the smallest MTU on the path, by trial
and error. There are probably some applications doing this auto-
matically, but I don't know of any.

I presume you have already searched Google for MTU discovery?

Best regards,
Paul


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