From: Pablo Neira Ayuso <pablo@netfilter.org>
To: Florian Westphal <fw@strlen.de>
Cc: "Fabien C." <7o5fzvj4duxjxzp@jetable.org>,
netfilter-devel@vger.kernel.org
Subject: Re: libnetfilter_queue: Some accepted packets get lost
Date: Thu, 10 Mar 2011 14:51:58 +0100 [thread overview]
Message-ID: <4D78D77E.6040703@netfilter.org> (raw)
In-Reply-To: <20110310062922.GY8821@Chamillionaire.breakpoint.cc>
On 10/03/11 07:29, Florian Westphal wrote:
> Fabien C. <7o5fzvj4duxjxzp@jetable.org> wrote:
>> Hello Pablo,
>>
>>>> 01) 20:08:00.486366: recv returned 108
>>>> 02) 20:08:00.486566: setting verdict : accept the packet...
>>>> 03) 20:08:00.486614 IP 10.3.5.8.46938 > 10.3.5.1.53: 51146+ A? www.mydomain.net. (35)
>>>> 04) 20:08:00.487193 IP 10.3.5.1.53 > 10.3.5.8.46938: 51146 1/3/3 A 12.34.123.210 (157)
>>>> 05) 20:08:00.586723: recv returned 108
>>>> 06) 20:08:00.586789: setting verdict : accept the packet...
>>>> [==> tcpdump doesn't see this one - so browser waits for 5sec, and retries]
>>>
>>> Check for errors in recv() to see if you are hitting ENOBUFS.
>>
>> Nope. recv() seems to be fine. As you can see from the output I gave in my
>> first message, it always returns positive values "recv returned 108".
>>
>> For the record, I must add: I compiled a custom 2.6.32 and surprisingly still
>> have the problem. Is it my config, or the Debian patches that make the
>> difference, I don't know...
>
> perhaps you're hitting this problem?:
>
> http://marc.info/?l=netfilter-devel&m=129016166319433&w=2
>
> It triggers when your receive a 2nd UDP packet with the same
> address/port pair while the 1st packet is still queued.
Fabien, to confirm that this is the problem, please use the following rule:
iptables -A OUTPUT -t raw -p udp --dport 53 -j NFQUEUE --queue-num 666
and retest. Let us know if that fixed it.
next prev parent reply other threads:[~2011-03-10 13:52 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-04 23:04 libnetfilter_queue: Some accepted packets get lost Fabien C.
2011-03-09 13:44 ` Pablo Neira Ayuso
2011-03-09 23:27 ` Fabien C.
2011-03-10 6:29 ` Florian Westphal
2011-03-10 13:51 ` Pablo Neira Ayuso [this message]
2011-03-10 21:21 ` Fabien C.
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