I have my router set up to work on both 2.4GHz and 5GHz using the same SSID in dual-band mode. Sometimes, when I am on the edge of the 5GHz range, I suspect that my very poor internet performance is due to my Mac Book connecting to the 5GHz band instead of the 2.4GHz.
How can I determine which band my laptop is connected to so that I can confirm or refute my hypothesis here? If my hypothesis turns out to be true, how can I force my Mac running OS X Yosemite, to switch over to the 2.4GHz band to get better performance when at the edge of 5GHz reception? How do I release this forced connection to 2.4GHz when I leave this region on the edge of reception for 5GHz?