From: Jeffrey Laramie <JALaramie@Loudoun-Fairfax.com>
To: netfilter@lists.netfilter.org
Subject: External IP addresses on internal network
Date: Tue, 26 Aug 2003 11:57:08 -0400 [thread overview]
Message-ID: <3F4B8354.7040903@Loudoun-Fairfax.com> (raw)
Hi all,
I recently updated my configuration by modifying one of my filter INPUT
rules to specify source IPs coming in from the LAN:
iptables -t filter -A INPUT -p all -i $LAN_Interface -s $LAN_IP_Range -j
Lan-Host
Packets not meeting this condition (among others) are logged and
dropped. The intent is to catch any internal packets coming from an
external IP address. No sooner did I load this rule when I started
logging packets with an AOL IP address coming from the LAN interface
going to port 53. I have a small LAN with only a handful of PCs which I
configured myself, so I'm a bit puzzled.
Have I configured this wrong? Several users connect to AOL through the
firewall so that's a possible cause, but I don't know why an AOL program
would spoof IPs. Thoughts?
next reply other threads:[~2003-08-26 15:57 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-08-26 15:57 Jeffrey Laramie [this message]
-- strict thread matches above, loose matches on Subject: below --
2003-08-26 22:43 External IP addresses on internal network George Vieira
2003-08-27 1:10 ` Jeffrey Laramie
2003-08-27 16:54 ` Jim Carter
2003-08-27 18:50 ` Jeffrey Laramie
2003-08-28 14:19 ` Chris Brenton
2003-08-28 15:43 ` Jeffrey Laramie
2003-08-28 14:56 ` Ramin Dousti
2003-08-28 16:21 ` Jeffrey Laramie
[not found] ` <3F4E2844.2050108@Loudoun-Fairfax.com>
2003-08-28 18:17 ` Ramin Dousti
2003-08-28 19:24 ` Jeffrey Laramie
2003-08-28 15:52 ` Michael J. Tubby B.Sc. (Hons) G8TIC
2003-08-28 16:19 ` Jeffrey Laramie
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