netdev - Re: NAT stops forwarding ACKs after PMTU discovery

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Message-ID: <1376920685.4226.61.camel@edumazet-glaptop>
Date:	Mon, 19 Aug 2013 06:58:05 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Christoph Paasch <christoph.paasch@...ouvain.be>
Cc:	Corey Hickey <bugfood-ml@...ooh.org>,
	Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
	Linux Netdev List <netdev@...r.kernel.org>,
	netfilter-devel@...r.kernel.org
Subject: Re: NAT stops forwarding ACKs after PMTU discovery

On Mon, 2013-08-19 at 15:49 +0200, Christoph Paasch wrote:

> 
> It's a TCP-patch, that interprets duplicate-acks with invalid SACK-blocks as
> duplicate acks in tcp_sock->sacked_out.

Yeah, but here, this is conntrack who is blocking the thing.

TCP receiver has no chance to 'fix' it.

See conntrack is one of those buggy middle box as well.

So if you want to properly handle this mess, you'll also have to fix
conntrack.



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