From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Sylvan Andrew" <sylvan_nids@norfolk.nf>
Subject: --state NEW -j DROP (would be great)
Date: Wed, 26 Oct 2005 17:07:42 +1130
Message-ID: <001501c5d9ef$62a26c30$0510a8c0@cornerpc>
Reply-To: Sylvan Andrew <sylvan_nids@norfolk.nf>
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Hello,

 Could somebody please explain the  'iptables -A INPUT -eth0 -m 
state --state NEW -j DROP' a bit more for me ?  I understand that it won't 
allow any outside initiated inbound connections into a network. However 
occasionally if I'm doing a tcpdump we see things like:

21:04:48.935367 IP 82.29.180.221.15378 > 213.17.40.204.4154: R 0:0(0) ack 1 
win 0
21:04:48.935447 IP 82.29.180.221.15378 > 213.17.40.204.4154: R 0:0(0) ack 1 
win 0
21:04:48.935455 IP 82.29.180.221.15378 > 213.17.40.204.4154: R 0:0(0) ack 1 
win 0
21:04:48.935537 IP 82.29.180.221.15378 > 213.17.40.204.4154: R 0:0(0) ack 1 
win 0
21:04:48.935545 IP 82.29.180.221.15378 > 213.17.40.204.4154: R 0:0(0) ack 1 
win 0
21:04:48.935629 IP 82.29.180.221.15378 > 213.17.40.204.4154: R 0:0(0) ack 1 
win 0
21:04:48.935637 IP 82.29.180.221.15378 > 213.17.40.204.4154: R 0:0(0) ack 1 
win 0
21:04:48.935812 IP 82.29.180.221.15378 > 213.17.40.204.4154: R 0:0(0) ack 1 
win 0
21:04:48.935821 IP 82.29.180.221.15378 > 213.17.40.204.4154: R 0:0(0) ack 1 
win 0
21:04:48.936045 IP 82.29.180.221.15378 > 213.17.40.204.4154: R 0:0(0) ack 1 
win 0
21:04:48.936053 IP 82.29.180.221.15378 > 213.17.40.204.4154: R 0:0(0) ack 1 
win 0
21:04:48.936153 IP 82.29.180.221.15378 > 213.17.40.204.4154: R 0:0(0) ack 1 
win 0

What is that and shouldn't it be dropped ? Or is the : R 0:0(0) ack 1 win 0 
part of it a already establish connection ? Although that's one of our IP's 
it's not active on our network.

Any ideas / advice  would be greatly appreciated !

Regards

Sylvan