From: Florian Westphal <fw@strlen.de>
To: "Russell King (Oracle)" <linux@armlinux.org.uk>
Cc: netdev@vger.kernel.org, netfilter-devel@vger.kernel.org,
coreteam@netfilter.org
Subject: Re: 6.1: possible bug with netfilter conntrack?
Date: Fri, 13 Jan 2023 00:45:03 +0100 [thread overview]
Message-ID: <20230112234503.GB19463@breakpoint.cc> (raw)
In-Reply-To: <Y8CaaCoOAx6XzWq/@shell.armlinux.org.uk>
Russell King (Oracle) <linux@armlinux.org.uk> wrote:
> Given the packet counts as per my example above, it looks like
> conntrack only saw:
>
> src=180.173.2.183 dst=78.32.30.218 SYN
> src=78.32.30.218 dst=180.173.2.183 SYN+ACK
> src=180.173.2.183 dst=78.32.30.218 ACK
>
> and I suspect at that point, the connection went silent - until
> Exim timed out and closed the connection, as does seem to be the
> case:
>
> 2023-01-11 21:32:04 no host name found for IP address 180.173.2.183
> 2023-01-11 21:33:05 SMTP command timeout on connection from [180.173.2.183]:64332 I=[78.32.30.218]:25
>
> but if Exim closed the connection, why didn't conntrack pick it up?
Yes, thats the question. Exim closing the connection should have
conntrack at least pick up a fin packet from the mail server (which
should move the entry to the 2 minute fin timeout).
next prev parent reply other threads:[~2023-01-12 23:45 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-12 23:03 6.1: possible bug with netfilter conntrack? Russell King (Oracle)
2023-01-12 23:38 ` Florian Westphal
2023-01-13 0:16 ` Russell King (Oracle)
2023-01-12 23:40 ` Russell King (Oracle)
2023-01-12 23:45 ` Florian Westphal [this message]
2023-01-13 11:12 ` Russell King (Oracle)
2023-01-13 12:56 ` Florian Westphal
2023-01-13 13:36 ` Russell King (Oracle)
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