WorldIP - IP Geolocation, Internet Research

In firewall it is possible to filter by country. It is very useful to block certain countries or to balance the requests to different backends, each of which handles its region.

Now WorldIP database exists in the format for geoip module from the extension package xtables-addons for iptables. Using this module, you can build more flexible rules for iptables, based on IP-geolocation.
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