From: Grant Taylor <gtaylor@tnetconsulting.net>
To: lartc@vger.kernel.org
Subject: Re: Connection tracking debugging?!
Date: Tue, 25 May 2021 17:55:33 +0000 [thread overview]
Message-ID: <e73467d1-0427-1cb5-4ea0-d86bfd35e8d4@spamtrap.tnetconsulting.net> (raw)
In-Reply-To: <20210525103639.GF3214@sv.lnf.it>
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On 5/25/21 4:36 AM, Marco Gaiarin wrote:
> How can i 'debug' this issue? Thanks.
I'd check the output of dmesg to see if you're exhausting the state
table. If you are, you'll see all sorts of messages from the kernel.
At least I did when I ran into this years ago. Adding memory addressed
the problem then.
Short of that low hanging fruit I'd start with packet captures so that
you can watch the traffic flow. I occasionally see invalid traffic
after the flow should have been closed.
It looks like your client may be sending TCP Reset packets. This could
be directly related to how different systems terminate a TCP connection.
-- Even if the clients agree, they may be doing something different
than the connection tracker helper expects, thus causing a subsequent
packet to be considered invalid after a shorter shutdown.
--
Grant. . . .
unix || die
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next prev parent reply other threads:[~2021-05-25 17:55 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-25 10:36 Connection tracking debugging?! Marco Gaiarin
2021-05-25 17:55 ` Grant Taylor [this message]
2021-06-04 15:23 ` Marco Gaiarin
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