Re: newbie question about port blocking

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Le jeu 17/04/2003 à 16:33, kenn murrah a écrit :
> BTW, i *AM* using squid, and my iptables already includes:
> iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j
> REDIRECT --to-port 3128
> so, will the setup you describe be the only thing i need to add in order to
> block non-http ports?

If you want to block everything else, than desactivate routing :

	echo 0 > /proc/sys/net/ipv4/ip_forward

You can also set FROWARD chain policy to DROP :

	iptables -P FORWARD DROP

This way, everything is denied, unless you use HTTP proxy.

-- 
Cédric Blancher  <blancher@xxxxxxxxxxxxxxxxxx>
Consultant en sécurité des systèmes et réseaux - Cartel Sécurité
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