• Hi Murali:

    My impression is that the 12-bit sequence number field has nothing to to with 802.11 security issues such as preventing spoofing. It is strictly a fragmentation and inadvertant duplicate frame discovery mechanism.

    Both 802.11 Robust Security Network (RSN) cipher suites, TKIP and CCMP, have 48-bit sequence counters used for confidentiality and integrity of encrypted frames. This includes protection from advertant duplication of frames.

    I hope this helps. Thanks. /criss

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