Just browsing around the Internet today I found a nice howto document explaining how to set-up our country IP block data with ipset utility. Ipset utility offers much higher performance than standard iptables rules (one IP range – one record, e.g. 10.1.1.0/16 for example).
Update: August 18th, 2012.
Thanks to our visitor comments we checked itech7 site and it’s registration was expired. We will probably come up with another reference/site shortly.