nixCraft

Hi All ,

We are using Fedora Core 2.0 , now i want to block all the ports accept 443 , 23,22,80 from iptables , i have made configure that every icmp traffic is block but want to configure to block all the ports ... please help ,,,

John

Type setup and select firewall tool open required ports from menu

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iptables -t filter -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -t filter -A INPUT -p tcp --dport 22 -m state --state NEW -j ACCEPT
iptables -t filter -A INPUT -p tcp --dport 23 -m state --state NEW -j ACCEPT
iptables -t filter -A INPUT -p tcp --dport 80 -m state --state NEW -j ACCEPT
iptables -t filter -A INPUT -p tcp --dport 443 -m state --state NEW -j ACCEPT
iptables -t filter -A INPUT -m state --state NEW -j DROP


The above will accept incoming connections to the destination ports you specified.

If this was for a firewall machine then you'd want to add the above substituting FORWARD for INPUT.

iptables processes rules from the top down. I.E. traffic destined for ports other than the ones specified will catch on the drop rule.