From: Ralf Spenneberg <lists@spenneberg.org>
To: Christof Nyffenegger <cnyf@yahoo.de>
Cc: Jim Carter <jimc@math.ucla.edu>,
Netfilter <netfilter@lists.netfilter.org>
Subject: Re: unexpected behaviour...?
Date: 02 Sep 2003 22:26:09 +0200 [thread overview]
Message-ID: <1062534369.6144.24.camel@kermit> (raw)
In-Reply-To: <20030828113329.32071.qmail@web21404.mail.yahoo.com>
Am Don, 2003-08-28 um 13.33 schrieb Christof Nyffenegger:
> --- Jim Carter <jimc@math.ucla.edu> schrieb:
> > Hmmm, good point. However, I think a packet is considered to be part of an
> > established connection because it has particular header bits set, not
> > because of IP address matching in the conntrack tables. Someone who's more
> > familiar with the sources, could you please confirm or correct this
> > statement?
No bits in the header. It is simply matching the IP addresses, protocol
and ports. If you add the TCP-Window-Tracking patch it does more.
At the moment TCP is handled just like UDP, ICMP, and generic
protocols.
If the client behind the firewall sends an ACK the connection is
automatically picked up by iptables.
Cheers,
Ralf
--
Ralf Spenneberg
RHCE, RHCX
Book: Intrusion Detection für Linux Server http://www.spenneberg.com
IPsec-Howto http://www.ipsec-howto.org
Honeynet Project Mirror: http://honeynet.spenneberg.org
next prev parent reply other threads:[~2003-09-02 20:26 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-08-22 22:42 unexpected behaviour...? Christof Nyffenegger
2003-08-25 21:29 ` Jim Carter
2003-08-26 19:48 ` Christof Nyffenegger
2003-08-27 3:52 ` Jim Carter
2003-08-28 11:33 ` Christof Nyffenegger
2003-08-28 16:29 ` Jim Carter
2003-09-02 19:59 ` Chris Brenton
2003-09-02 20:26 ` Ralf Spenneberg [this message]
-- strict thread matches above, loose matches on Subject: below --
2003-09-08 21:24 Christof Nyffenegger
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