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Written by Devin Akin
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Thursday, 09 August 2007 |
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Now we have two new 802.11 friends called A-MSDU and A-MPDU. Their job: to make the protocol analyst's job more difficult.
A-MSDU = Aggregate MSDU
A-MPDU = Aggregate MPDU
Both can be used together, with restrictions (of course, because it's not as much fun unless you have extra rules to follow).
You can string MSDUs together - called subframes when aggregated - in the payload of a single QoS MPDU. An A-MSDU subframe structure consists of:
DA (6), SA (6), Length (2), MSDU (0-2304), Padding (0-3) -- all of the numbers are in octets |
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Written by Eric Geier
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Wednesday, 08 August 2007 |
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Make certain you have solid support plans, including knowledgeable staff and the correct tools, before you give a thumbs up for that new wireless network. |
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Written by Devin Akin
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Wednesday, 08 August 2007 |
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The 802.11n amendment allows for up to 4x4 MIMO. That's 4 transmitters and 4 receivers working at the same time. Due to cost, nobody is building a 4x4 system. Instead, we're seeing 2x2 on the cheap stuff, 2x3 on the higher-end client radios and the lower-end APs, and 3x3 on the higher-end APs. More transmitters and receivers means better quality: better reception, higher throughput, the works. Always look for 2x3 stations and 3x3 APs whenever possible. |
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Written by Keith Parsons
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Tuesday, 07 August 2007 |
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Earlier this year Nokia released an updated version of their popular Nokia N770 Internet Tablet. The N800 excels at being a small, light-weight device capable of WiFi as well as Bluetooth access to the Internet. THis is a user-based review of this great little device. |
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Written by Devin Akin
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Tuesday, 07 August 2007 |
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In my daily foraging for goodies in the 802.11 standard, I tripped across what seemed to be something routine, but upon deeper inspection (the reading of several RFCs), it seems that PAP, CHAP, and MS-CHAP cannot be used between an authenticator and authentication server in an RSN. |
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Written by Devin Akin
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Monday, 06 August 2007 |
When will the madness end? With 802.11n, we have a newly elongated frame format.
Frame Control: 2 octets
Duration/ID: 2 octets
Address 1: 6 octets
Address 2: 6 octets
Address 3: 6 octets
Sequence Control: 2 octets
Address 4: 6 octets
QoS Control: 2 octets
HT Control: 4 octets (new!)
Frame Body: 0-7955 octets (yeah baby!)
FCS: 4 octets |
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