How do I set up wireless on Centos?
You can start by listing all ethernet devices detected by the kernel:
lspci|grep -i eth
If you can't find iwconfig, install the wireless-tools package (yum install wireless-tools). If iwconfig reports a device with wireless extensions, then you're half-way there. Report back and we'll help you associate w/an SSID, enter a Key, etc.
If you don't, you'll need to get the proper driver loaded. Try this site for help:
What version of CentOS are you using?
What is the vendor/model of your wireless adapter hardware?