From: "Gáspár Lajos" <swifty@freemail.hu>
To: Micheal Wolfskill <tdgh2323@hotmail.com>
Cc: netfilter@vger.kernel.org
Subject: Re: Help with invalid packets.
Date: Mon, 19 Mar 2012 16:58:49 +0100 [thread overview]
Message-ID: <4F6757B9.2060103@freemail.hu> (raw)
In-Reply-To: <BLU144-W3712D3E518F5611A6BD840D0420@phx.gbl>
Hi,
202-03-19 16:39 keltezéssel, Micheal Wolfskill írta:
> Its not affecting the normal viewing of my site.. but I wish to know
> why it is matching these packets as Iam sure it should not.
Don't be so sure! :D
AFAIK iptables/netfilter uses a different state machine than the TCP
stack in the kernel...
http://userpages.umbc.edu/~jeehye/cmsc491b/lectures/tcpstate/sld001.htm
http://www.lug.or.kr/docs/iptables-tutorial/chunkyhtml/c4219.htm
On this page:
http://www.lug.or.kr/docs/iptables-tutorial/chunkyhtml/x4436.htm
"If the connection is reset by a RST packet, the state is changed to
CLOSE. This means that the connection per default has 10 seconds before
the whole connection is definitely closed down. RST packets are not
acknowledged in any sense, and will break the connection directly."
Maybe that is the source of your problem. Or there may be some timing
issues (lifetime of a connection, etc.)
Swifty
next prev parent reply other threads:[~2012-03-19 15:58 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-19 15:39 Help with invalid packets Micheal Wolfskill
2012-03-19 15:58 ` Gáspár Lajos [this message]
2012-03-19 17:01 ` Maarten Vanraes
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