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Old 10-25-2001, 03:01 PM   #1
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Registered: Jun 2001
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iptables - advanced port blocking/stealth mode

Hi guys,

I used to use ipchains (2.2.x kernel) and had ip masq rules setup (for sharing my cable modem onto my lan). I then upgraded to the latest Slackware version (8 i think) and installed kernel 2.4.x and then noticed i needed to use iptables.

I have iptables setup to do basic ipmasq, but I haven't been able to find any info of howto secure it (i.e. get all my crappy ports reporting stealth on steve gibsons shields up site). Does anyone have/know of any info on iptables configuration???

Old 10-26-2001, 05:21 AM   #2
Registered: Apr 2001
Location: London
Posts: 408

Rep: Reputation: 31

try playing with.

iptables -A INPUT -p tcp ! --syn -m state --state NEW -j LOG --log-prefix "New not syn:"
iptables -A INPUT -p tcp ! --syn -m state --state NEW -j DROP

Go to the following links for the info your looking for.



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