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iptables: |-
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View all current iptables rules:
$ iptables -L -nv
View all INPUT rules:
$ iptables -L INPUT -nv
block an IP address using iptables:
$ iptables -I INPUT -s "" -j DROP
To block a range of IP addresses:
$ iptables -I INPUT -s "" -j DROP
How to unblock an IP address:
$ iptables -D INPUT -s "" -j DROP
How to block all connections to a port:
To block port 25:
$ iptables -A INPUT -p tcp --dport 25 -j DROP
$ iptables -A INPUT -p udp --dport 25 -j DROP
How to un-block:
To enable port 25:
$ iptables -A INPUT -p tcp --dport 25 -j ACCEPT
$ iptables -A INPUT -p udp --dport 25 -j ACCEPT
Save a copy of the current rules
$ iptables-save > ~/saved.rules
Restore a copy of some rules
$ iptables-restore < ~/saved.rules
To save all rules so that they are not lost in case of a server reboot:
$ /etc/init.d/iptables save