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If you're looking for a firewall/router platform, the Vigor 120 works well with [http://pfSense.org pfSense] on both 20CN and 21CN BT ADSL lines. pfSense does not yet have IPv6 support in the current release version (2.0.1 as of 16 May 2012). The development snapshots for 2.1 do support IPv6. You might also want to look at [http://m0n0.ch/wall/ MonoWall], a sister project of pfSense. Both projects are built on FreeBSD Unix and setup and management is done in your web browser.