How to block an IP from your server
If you want to block access to your server for whatever reason,
you will need to log into the shell as root. Your server should
either have ipchains or iptables to help accomplish this.
In this example, the attacking IP is 192.168.56.210 .
If you are using ipchains, type "ipchains -A input -j DENY -p
all -l -s 192.168.56.210/32"
If you are using iptables, type "iptables -A INPUT -s
192.168.56.210/32 -j DROP"
If you just want to block access to one port from an ip :
iptables -A INPUT -s 192.168.56.210/32 -p tcp --destination-port
23 -j DROP
The above would drop all packets from 192.168.56.210/32 to port
23 (telnet) on the server.
Original:
http://www.ukwebmasterforums.com/t4927-how-to-block-an-ip-from-yo
ur-server.html
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