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GeoIP Filtering on Ubuntu 12.04 LTS

Though Ubuntu Linux offers packages for GeoIP filtering, some manual steps are still required for realization.

1. Install the Kernel module + userspace programs\\sudo aptitude install xtables-addons-common
   
2. Create the directory for the GeoIP list\\sudo mkdir /usr/share/xt_geoip
   
3. Install the Perl module (optional)\\sudo aptitude install libtext-csv-xs-perl
   
4. Download GeoIP list\\sudo /usr/lib/xtables-addons/xt_geoip_dl
   This will download the list to the current directory, if you want to change this, do that before execution of this command!
5. Convert the GeoIP list\\sudo /usr/lib/xtables-addons/xt_geoip_build -D /usr/share/xt_geoip *.csv
   This will build the output files in /usr/share/xt_geoip and assumes the GeoIP list is located in the current directory. Please also noted, that you have to specify “*.csv”, otherwise nothing will happen.
6. Test everything\\sudo iptables -F && iptables -A OUTPUT -m geoip –dst-cc US -j DROP
   This will block all outgoing traffic to IP addresses located in the USA, next you can try to visit Google, this should not work anymore.

References:

1. Robert Haddon's Blog, Words from High, (last visited on 2012-10-27)
2. xtables on sourceforge.net, (last visited on 2012-10-27)