Wireless Packet Size
The MTU of wireless networks is 2,312 bytes. This size includes the packet headers. The Wireless MTU is considerably larger than the Ethernet recommendation for wired networks, which is 1,500 bytes. However, this larger size is only practical for traffic traveing within the network. Any communication intended to travel over the Internet would encounter problems, and would have to split up into smaller packets to pass through the Internet service provider's network. ISPs operate with the standard wired network MTU of 1,500 bytes. However, some add on an extra header when communicating with customers. This eight byte field reduces the maximum packet size to 1.492 bytes.---------------------------------------------------
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
the total frame sizes will be 2346, 2354 and 2364 respectively. The packet size of body (data) is 0-2312 but the largest frame size is 2346 (RTS Threshold default).
Max MPDU size is 2346 Bytes. payload(data) is varied according to the encryption schemes
The 802.11 packet on the air will change size based on data payload, encryption, WMM settings, CCX or any other proprietary headers.
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