How to statically configure DNS servers on a Cisco router when the WAN interface uses DHCP?

Posted by Massimo on Server Fault See other posts from Server Fault or by Massimo
Published on 2014-05-26T19:05:47Z Indexed on 2014/05/26 21:31 UTC
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Filed under:

dns

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cisco

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router

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dhcp

I have a Cisco router (model 887VA, IOS 15.4) used to connect a LAN to the Internet via ADSL. The WAN interface uses DHCP:

interface ATM0.1 point-to-point
 ip address dhcp

I need the router to use a statically-defined DNS server for name resolution:

ip name-server A.B.C.D

However, the router insists on using the DNS servers supplied by the ISP via DHCP:

Router#ping www.google.com
Translating "www.google.com"...domain server (<ISP DNS>) [OK]

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 173.194.116.208, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 44/45/48 ms

How can I tell the router to ignore the ISP-supplied DNS servers and only use the statically-configured one?

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