2007/6/27, Grant Taylor <gtaylor@xxxxxxxxxxxxxxxxx>:
On 6/27/2007 12:12 AM, Ditro - BipinDas wrote: > I do have a Exim mail server with IPTABLES and TCP WRAPPER as > firewall. Yesterday I had noticed that,there is continuous smpt > connection from an IP. I would like to block these IP,if there is > more than 10 connection in 30 second. Is this possible using IPTABLES > command. If yes,Please guide me. Use the IPTables "recent" match extension to match on newly established SMTP sessions and reject them if there have been more than 10 in the last 30 seconds.
iptables -I INPUT -p tcp --dport 25 -i eth0 -m state --state NEW -m recent \ --update --seconds 30 --hitcount 10 -j DROP
Grant. . . .
