What does 'current channel' mean in Yosemite wireless diagnostics? I'm trying to troubleshoot some wifi issues I'm having after I updated to Yosemite. I'm using Wireless Diagnostics to try to figure out what channel I should force my network on because I noticed events such as kernel[0]: wl0: Roamed or switched channel, reason #8, bssid ... very close in time to when my connection drops.



As you can see in the screenshot, I am connected to a network on channel 2 (the one in bold) but Network Diagnostics says that the current channel is 1. What is the meaning of current channel
?
Wi-Fi has multiple channels, which specify what frequency the network is communicating on.  On the 2.4GHz frequency, channels 1, 6, and 11 are non-overlapping channels, and all the others overlap on these channels.  (On the 5GHz frequency, the channels are spaced out to avoid overlapping).  You can think of channels as an offset value from 2.4GHz.

Current channel is the Wi-Fi channel your router is advertising and the channel your computer is connecting to.  You might get better performance by using either a 5GHz channel if your Wi-Fi router supports it, or one of the non-overlapping ones on the 2.4GHz.