Independent Basic Service Set (sometimes incorrectly called AdHocMode). Does not require an AccessPoint to route packets through (which is called [BasicServiceSet BSS] mode).

If you run in IBSS mode then you should make sure that RTS/CTS is configured with a threshold of 200 bytes. Otherwise you risk problems when you encounter the 'hidden node' problem. RTS/CTS solves this problem, but most cards don't have it enabled by default. If you do not enable then you may have severe performance issues when multiple nodes are connected together over longer distance links.

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Also see [Layer2Assumptions]