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How To Turn Off Cisco Router Domain Lookups
Cisco routers and switches are everywhere. It quietly handles the majority of the internet traffic hidden in closets and datacenters in the form of routers, switches, firewalls and other appliances. As intelligent as Cisco devices are there are a few annoyances that bother me from time to time. One of them is the domain lookups that routers perform.
Whenever I put in a misspelled command or some accidental key strokes such as below it locks up the computer for 30seconds to a minute depending on how long the router is looking for the server.
To turn this feature off you have to turn off domain lookups under the router configuration mode.
Commands:
R0#conf t
Enter configuration commands, one per line. End with CNTL/Z.
R0(config)#no ip domain lookup
R0(config)#^Z
R0#
| Print article | This entry was posted by TechVirgin on August 18, 2009 at 10:42 am, and is filed under Cisco, Featured, Technology. Follow any responses to this post through RSS 2.0. You can leave a response or trackback from your own site. |


about 2 years ago
The no ip domain-lookup command will prevent you from comunicating with other devices on the network using domain names instead of IP addresses. But, if you’ve configured some ip host statements, you can still ping these hosts using the names you’ve already configured.
about 2 years ago
Don't you feel that there's too much of Cisco around us? Anyway, I couldnt have said it any better. I'll share this with some of my younger friends.
Thanks Shamim.
about 2 years ago
It actually locks up any other domain resolution attempts? Wow that is pretty bad…
about 2 years ago
Yea nothings more annoying than having to wait for the Cisco device to stop trying to resolve some host name that doesn't exist!
about 1 year ago
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