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.

router-domain-lookup

To turn this feature off you have to turn off domain lookups under the router configuration mode.

no-ip-domain-lookup

Commands:

R0#conf t
Enter configuration commands, one per line. End with CNTL/Z.
R0(config)#no ip domain lookup
R0(config)#^Z
R0#