From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <582574ba979f2be0ec51fe1add8f3121@hamnavoe.demon.co.uk>
To: 9fans@cse.psu.edu
Subject: Re: [9fans] Re: IP_DF bit and broken connections
From: Richard Miller <miller@hamnavoe.demon.co.uk>
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Date: Thu,  5 Dec 2002 21:06:03 +0000
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> Some routers eat packets with size 1500 (eg.  adsl from telefonica in
> spain) without fragmenting or sending icmps. Too bad.
> ...
> With tcp, Linux has its mtu at 1500 and negotiates its mss of 1460.
> The same does Plan 9, but despite this, Linux sends packets of at most
> 1444 bytes when going through the router and Plan 9 sends up to 1500
> (which IMHO is legitimate)...

Users of ADSL as provided by British Telecom and its resellers have been
advised that "the optimum MTU setting is 1458".