Re: Per route MTU settings are broken in linux kernel 3.2

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On Mon, 2013-06-24 at 20:08 +0700, Yura Pakhuchiy wrote:
> On Mon, 2013-06-24 at 13:45 +0100, Ben Hutchings wrote:
> > On Mon, 2013-06-24 at 15:44 +0700, Yura Pakhuchiy wrote:
> > > Hello Ben,
> > > 
> > > Looks like setting per route MTU (as described in [1]) is broken in
> > > Linux kernel 3.2. I tested with newer Ubuntu kernels 3.5 and 3.8 and it
> > > looks like problem is fixed there. I filled Ubuntu bug report [2] with
> > > more details and sample script which illustrates problem. But since this
> > > problem is probably also present in stock kernel (not just in Ubuntu),
> > > is it possible to backport fixes to stable 3.2 series?
> > > 
> > > 1. http://lartc.org/howto/lartc.cookbook.mtu-discovery.html
> > > 2. https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1177507
> > 
> > Sure, what are the fixes?
> 
> Actually, I do not know :-( Ubuntu devs have not fixed this problem in
> Ubuntu 3.2 kernel. But these commits in mainline kernel looks related:
> https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?id=9b04f350057863d1fad1ba071e09362a1da3503e
> https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?id=5f2d04f1f9b52604fca6ee08a77972c0df67e082
> https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?id=d851c12b60471188e15e5c8405b289073e8dd025
> https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?id=7f92d334ba19a0d8e96f8f8f092219553367d921
> https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?id=ee9a8f7ab2edf801b8b514c310455c94acc232f6
> https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?id=38d523e2948162776903349c89d65f7b9370dadb
> https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?id=fa1e492aa3cbafba9f8fc6d05e5b08a3091daf4a
> https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?id=05ab86c55683410593720003442dde629782aaac
> https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?id=9cb3a50c5f63ed745702972f66eaee8767659acd
> https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?id=b44108dbdbaa07c609bb5755e8dd6c2035236251
> 
> However I'm not sure whether they all are required or sufficient to fix
> everything correctly.

Sorry, but I really do need someone to tell me exactly what's required.
I'm not likely to find the time to work this out myself.

Ben.

-- 
Ben Hutchings
Knowledge is power.  France is bacon.

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