View NAT entries:
iptables -t nat -nL
View normal entries:
iptables -nL
Save active iptables rules:
/etc/init.d/iptables save active
Restore iptables rules from a file:
cat /etc/sysconfig/iptables | iptables-restore -c
Drop requests from an IP (until reboot or rule is made permanent):
iptables -A INPUT -s xxx.xxx.xxx.xxx -j DROP
Redirect traffic on a certain IP, port 80, to server cp on port 2082:
iptables -t nat -A PREROUTING -p tcp -d xxx.xxx.xxx.xxx --dport 80 -j DNAT --to xxx.xxx.xxx.xxx:2082
