Folks, I am making plans to convert my wireless network from 802.11b/g to 802.11g only. I've done a fair amount of research and have discovered that there is a 66% performance hit when running mixed b/g mode compared to a stricty .g network. This is because a .b client in the mix will drop the network into protection mode where the APs perform extra processing to make sure they do not step on the .b modulated traffic.
The performance gain is the driving factor behind this initiative. I want to keep my network out of protection mode.
Now I know that all our managed clients will support .g-only. My question here is whether anyone knows what will happen to the .g-only network if it detects neighboring business .b clients probing. We are located in a dense urban location. So will these neighboring .b clients drop my .g-only network into protection mode if APs hear these .b modulated probes/beacons even if these .b clients do not associate?
If that is the case, then it may not be worth converting to .g-only, if our neighbors can still impact the performance of our network in that way.
Any thoughts are appreciated.
By disabling 802.11b, you'll be disabling the 1, 2, 5.5, and 11Mbps data rates. These are the rates at which 802.11b clients probe, so your APs will be immune to such probing.
Best of luck! It's exciting that you get to disable 802.11b, I see too many businesses that don't want to do so for one reason or another. You should enjoy some pretty fast rates in a pure G environment.
Your neighbors will not be able to enable protection mode on your network. If you have your network in g-only mode, it will completely ignore non-g traffic.
Further, even without enabling g-only mode, the AP only goes into protection mode when it negotiates association with a b client, which wouldn't happen if your neighbor is not probing the appropriate SSID.
Hope this helps.