From: netfilter@buglecreek.com
To: netfilter@vger.kernel.org
Subject: State Explanation
Date: Sun, 17 Jul 2011 18:01:39 -0600 [thread overview]
Message-ID: <1310947299.8819.2152814541@webmail.messagingengine.com> (raw)
In the course of troubleshooting a very simple iptables ruleset that is
inexplicably dropping packets (more on that later) I came across a
explanation in a Iptables Firewall book regarding the NEW state when
using "-m state --state NEW" in a rule. It states "NEW is equivalent to
the initial TCP syn request, or to the first UDP packet". I have also
seen in some resources that "-m state --state NEW" will allow any packet
through whether a syn bit is set or not.
So if for some reason a packet that just has the ack bit set and the
state is not known (ESTABLISHED, RELATED) it will be allowed through due
to the -m state --state NEW?
next reply other threads:[~2011-07-18 0:01 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-18 0:01 netfilter [this message]
2011-07-18 8:36 ` State Explanation Jan Engelhardt
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