netdev - Re: UDP path MTU discovery

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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.
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html