[ubuntu] opendns - all connections rather than 1 by 1?

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http://ubuntuforums.org – So I'm going to try out opendns as an internet filter. But I'm not doing it on a network/router, just on my local machine. Using ubuntu, I read that I need to select each connection and change the dns settings. Is there a way to generically add the dns settings so that if I connect to a new network I don't have to manually update it's settings? (HowTos)