From: "Sylvan Andrew" <sylvan_nids@norfolk.nf>
To: netfilter@lists.netfilter.org
Subject: --state NEW -j DROP (would be great)
Date: Wed, 26 Oct 2005 17:07:42 +1130 [thread overview]
Message-ID: <001501c5d9ef$62a26c30$0510a8c0@cornerpc> (raw)
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
next reply other threads:[~2005-10-26 5:37 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-10-26 5:37 Sylvan Andrew [this message]
2005-10-26 5:47 ` --state NEW -j DROP (would be great) Henrik Nordstrom
2005-10-26 5:58 ` Aseem Rastogi
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