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:: KB Home / Operating Systems / How can I block IP addresses?
How can I block IP addresses?
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Views: 722
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Posted: 03 Jun, 2007
by: Support T.
* * * * *
Updated: 19 Feb, 2008
by: Support T.

SSH to the server and run The following command to see the IPs with most concurrent connections:

/bin/netstat -ntu | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n |more

Block un-wanted IPs using IPTables

/sbin/iptables -I INPUT -s 12.34.56.78 -j DROP
/sbin/service iptables save
/sbin/service iptables restart
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