[ubuntu] How to keep dns-nameservers line in interfaces?

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http://ubuntuforums.org – Hi guys, I'm running a server with Ubuntu 12.10. For some reason, however, the line Code: dns-nameservers disappears from time to time which causes severe mayhem, including mail messages not being delivered, etc. Could you tell me how to set up the DNS properly so that they stay in place no matter what? Thanks a lot! (Hardware)