Useful IP Tables commands

Blocking IP’s using IP Tables

iptables -I INPUT -s xxx.xxx.xxx.xxx -j DROP

 

 

OR just for port 80

Iptables –A INPUT –src xxx.xxx.xxx.xxx –p tcp --dport 80 –j REJECT

 

 

Block PING

iptables -A INPUT -p icmp -m state --state NEW -j DROP

Port Redirection

This is useful if you need to access email on a different port due to ISP restrictions.

 

# Allow incoming port 587 (tcp) SMTP traffic, and redirect it to port 25

/sbin/iptables -A INPUT -p tcp --dport 587 -j ACCEPT

/sbin/iptables -A PREROUTING -t nat -p tcp --dport 587 -j REDIRECT --to-port 25