troubleshooting Question

802.11 frame size

Avatar of super_mario25
super_mario25 asked on
Wireless NetworkingWireless HardwareEncryption
5 Comments1 Solution2978 ViewsLast Modified:
Hi all,

I am a bit confused about the 802.11 frame size and how it changes when applying WEP and WPA.

Unencrypted 802.11 frame:
header    |   data          | FCS
(30)           (0-2312)        (4)  bytes

WEP frame:
header    | IV   |  EIV    |  data          | FCS
(30)           (4)     (4)      (0-2312)        (4)  bytes

WPA (TKIP) frame:
header    | IV   |  EIV    |  data          | MIC     |   ICV    |   FCS
(30)           (4)     (4)      (0-2312)        (8)           (4)       (4)  bytes

My questions is: Is the data of each of the above frames correct or does it decrease? If it doesnt decrease, than the total frame sizes will be 2346, 2354 and 2364 respectively. Is this correct? I am really confused because all literature says that the packet size of body (data) is 0-2312 but the largest frame size is 2346 (RTS Threshold default).

Any help will be appreciated, Thank you in advance,
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