netdev - Re: UDP path MTU discovery

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Message-ID: <20100330061952.GO20695@one.firstfloor.org>
Date:	Tue, 30 Mar 2010 08:19:52 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	"Edgar E. Iglesias" <edgar.iglesias@...il.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	"Templin, Fred L" <Fred.L.Templin@...ing.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Rick Jones <rick.jones2@...com>, Glen Turner <gdt@....id.au>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: UDP path MTU discovery

> If you don't want to hassle with all of that, the app can stick to
> 1280 (or I guess for the extreme/lazy cases turn on fragmentation)..

See the early mails in this thread. This is about apps who can't
limit themselves to 1280, but still don't want full blown PMTU.
[They probably should, but it can be a lot of work]

The MTU would allow to force fragmentation on the sending host
as a workaround similar to IPv4.

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only.
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