From: Florian Westphal <fw@strlen.de>
To: Eray Bilgin <bilgin@eray.ca>
Cc: netfilter <netfilter@vger.kernel.org>
Subject: Re: connection tracking fails to update udp timer
Date: Tue, 11 Mar 2025 15:48:12 +0100 [thread overview]
Message-ID: <20250311144812.GA12767@breakpoint.cc> (raw)
In-Reply-To: <1958568e9a1.be49b3ad53051.1702359735061948725@eray.ca>
Eray Bilgin <bilgin@eray.ca> wrote:
> i noticed this when my voip phone mysteriously stopped ringing. i use
> a tp-link router as a gateway which i'm certain is running
> linux/netfilters, though i don't know what version. i've observed the
> same problem on my raspberry pi running iptables v1.8.2.
>
> usually the first thing a sip client does is register with the provider's
> server. this has the effect of punching a hole through any firewalls in
> its path. after that initial registration, my provider keeps the
> connection alive by sending messages every 60 seconds.
>
> when netfilters sees traffic moving back and forth, the connection should
> transition to the assured state and set the expiration timer to
> nf_conntrack_udp_timeout_stream, which by default is 120 seconds. but in
> this case the timer is reset to nf_conntrack_udp_timeout, which is 30
> seconds. the connection does not appear as "assured".
Replies during first 2 seconds are ignored in order to prevent
DNS requests from triggering assured state + 2m timeout.
next prev parent reply other threads:[~2025-03-11 14:48 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-03-11 13:33 connection tracking fails to update udp timer Eray Bilgin
2025-03-11 14:48 ` Florian Westphal [this message]
-- strict thread matches above, loose matches on Subject: below --
2025-03-11 18:39 Eray Bilgin
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