In one of my previous posts I've been writing about the problems I had when the DHCP client on Cisco IOS was messing up the DNS name-servers I've configured manually with the ip name-server configuration command. As is quite usual in Cisco IOS, there's one more know to turn to fix this - the Configurable DHCP Client feature introduced in IOS release 12.3(8)T.
To stop the router's DHCP client from overwriting the static name-server settings, use the no ip dhcp client request dns-nameserver interface configuration command (you can also exclude a few other DHCP options).
Ivan Pepelnjak, CCIE#1354, is the chief technology advisor for NIL Data Communications. He has been designing and implementing large-scale data communications networks as well as teaching and writing books about advanced technologies since 1990. See his full profile, contact him or follow @ioshints on Twitter.
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