I have a wrt54g router that is connected via ethernet to my main dekstop PC
Is there a way or some software that I can use that let me monitor any wirelss signals or networks from the desktop? or do I need to use a wifi card instea?
Yeah, sorta. It would have been nice if you specificed what hardware version of WRT54G (see serial number tag) and what firmware version. There are 8 versions, most of which are quite different from each other. Since you also didn't bother mentioning your operating system, I'll assume Windoze XP Home.
The ultimate sniffer is Kismet Drone. See:
I suspect you don't want to go through all that to make it work.
I use DD-WRT v23 SP3 on my home router. It has several monitor modes to identify AP's and clients using WiViz:
In its present form, methinks it sucks, but it does function, sorta.
You can also scan from the command line using the Linux "wl" command. From a previous posting:
For example, from my palatial office: wl ap 0 (turn off access point mode) wl scan (scan for access points) wl scanresults (display results) wl ap 1 (turn access point mode back on)
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