netdev - Re: UDP path MTU discovery

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Message-ID: <20100330160602.GS20695@one.firstfloor.org>
Date:	Tue, 30 Mar 2010 18:06:02 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	"Templin, Fred L" <Fred.L.Templin@...ing.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	"Edgar E. Iglesias" <edgar.iglesias@...il.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

> Right again. Unlike IPv4, however, IPv6 does not allow
> in-the-network fragmentation. So when in doubt, apps
> that need to send isolated packets that may violate the
> path MTU should really perform host-based fragmentation
> with a maximum fragment size of 1280. Isn't there a
> socket option "IPV6_USE_MIN_MTU" that apps can use to
> force fragmentation on large packets (RFC3542)?

Thanks for the pointer. The option is right now only defined,
but not implemented.  But yes it would help. 

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