If your doing it with aps, each sniffer ap would have to be on the same channel as the ap you want to sniff. So if you have 10 aps, you need 10 sniff aps. Then you need to ascend the sniffer aps to wireshaek. In my case I use the omni peek wifi appliance.
"Satisfaction does not come from knowing the solution, it comes from knowing why." - Rosalind Franklin
___________________________________________________________
