From: Patrick McHardy <kaber@trash.net>
To: "Lars Täuber" <lars.taeuber@gmx.net>
Cc: netfilter@vger.kernel.org
Subject: Re: nat problem: What's so special with traffic from audibank.de?
Date: Fri, 04 Dec 2009 07:14:44 +0100 [thread overview]
Message-ID: <4B18A8D4.901@trash.net> (raw)
In-Reply-To: <20091203235443.9d5bb632.lars.taeuber@gmx.net>
Lars Täuber wrote:
> Hi Mattias,
>
> On Thu, 03 Dec 2009 23:22:47 +0100 Mattias Rönnblom <hofors@lysator.liu.se> wrote:
>> I'll do some guessing here. It looks like the first large (MSS-sized)
>> segment is lost. I've seen this happening in networks where Path MTU
>> Discovery didn't work (because ICMP Fragmentation Needed was
>> filtered).
>
> you're absolutely right.
> I could solve my problem with either allow any icmp traffic from outside to any destination or use the clamp-to-pmtu in the server settings for the firewall. This is a switch in fwbuilder.
>
> Why is such an ICMP message not RELATED in the meaning of
> echo "-A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT"
> with a _related_ tcp connection?
It should be. Please post a dump of the relevant ICMP message
and the connection tuples from /proc/net/nf_conntrack for the
original TCP connection.
next prev parent reply other threads:[~2009-12-04 6:14 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-03 14:48 nat problem: What's so special with traffic from audibank.de? Lars Täuber
2009-12-03 22:22 ` Mattias Rönnblom
2009-12-03 22:54 ` Lars Täuber
2009-12-04 6:14 ` Patrick McHardy [this message]
2009-12-05 22:19 ` Lars Täuber
2009-12-06 7:37 ` Lars Täuber
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