IPTables Script to Fend Off DDOS Attacks

We recently have had a number of sites that have been hit by DNS amplification DDOS attacks. You can turn off recursion and do other things in NAMED to prevent you from being a target but once they target you the attack can go on for a long time after your server has been properly configured. This script is also good for thwarting SSH, IMAP, and POP3 probes. Just change the port number and tune the limits.

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