Block IP with iptables

Block Incoming Request From IP 1.2.3.4

The following command will drop any packet coming from the IP address 1.2.3.4:


# /sbin/iptables -I INPUT -s {IP-HERE} -j DROP
# /sbin/iptables -I INPUT -s 1.2.3.4 -j DROP

Finally, the last thing we need to do is save our rules so that next time we reboot our computer our rules are automatically reloaded:


# /sbin/service iptables save

Check to see if it is added:

# iptables --list -n | grep 37.233.38.46
DROP       all  --  37.233.38.46         0.0.0.0/0

Other good info to check out:

http://wiki.centos.org/HowTos/Network/IPTables