Most wireless vendors recommend that unless there is a need to support them, 802.11b should be disabled on the network.
How should I go about disabling 802.11b on my network?
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I have come across three different ways you may be able to go about disabling 802.11b, depending on your situation and wireless vendor. I will start with what should generally be the most preferential choice, but any of them will work.
The third method allows you to keep the 1/2/5.5/11 Mbps data rates enabled in case you have non-802.11b devices that require them. This may not be common, but I know that most Nintendo Wii gaming consoles require 1 and/or 2 Mbps to be supported to connect (although after they connect, they will operate at 802.11g speeds). I have heard third hand that there is also a smartphone that has the same problem, but I do not know make/model or experienced it myself.