From: Igor Bogomazov <bi@hl.ru>
To: netfilter@vger.kernel.org
Subject: INVALID connections and SNAT
Date: Mon, 12 Apr 2010 20:30:37 +0400 [thread overview]
Message-ID: <20100412203037.25956ce2@admin.hl.ru> (raw)
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Hello,
Just noticed few packets which pass SNAT in POSTROUTING without
altering their SRC. The problem has been obscured by the fact, that all
works in general, no one complain.
After I add REJECT rule for "-m state --state INVALID" connections,
unmodified (not NATed) packets have disappeared. All right now.
Why INVALID connections pass thru NAT instead of dropping them? It
seems like a security risk, when hacker can listen not-NATed packets
behind the router and learn a network topology.
--
С уважением,
Igor Bogomazov
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next reply other threads:[~2010-04-12 16:30 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-12 16:30 Igor Bogomazov [this message]
2010-04-12 16:56 ` INVALID connections and SNAT Jan Engelhardt
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