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Increase WLANspeed, how??

Discussion in 'Networking Issues' started by Grizzly1505, Apr 22, 2008.

  1. Grizzly1505

    Grizzly1505 Addicted to LI Member

    recently I bought a WRT54GL to replace my USR stuff. with my main computer connected via wire i get the full speed of abt. 9MBps. Just the WLAN does not want to be as fast as the wired connection. that one is always around 2,5MBps. Is there a way that the speed can be improved?
    Firmware is 4.30.11 and the wlan card in my laptop is a Intel 3945ABG using newest driver. adjusting the MTU did not do anything good.

    I really appreciate any help
     
  2. HennieM

    HennieM Network Guru Member

    There are many ways, depending on what is causing the slower speed. Most of the ways usually start with replacing the stock firmware with firmware that allows you more control, such as Tomato or Thibor15c.

    Then, make sure you have frameburst on, G-only, use WPA/AES if you use encryption (not WEP or WPA/TKIP) on the router, and increase your receive buffer on the wireless [the 3945] (I forget how to do that, so search this forum).

    Further, make sure you have a good signal from the router to your laptop, and also from the laptop to the router (on 3rd party firmware you can see how strong the signal is that the router receives). Check for interference from other radio devices, which will be indicated by a high noise level, and do a wireless survey to see whom in your area is perhaps using a channel near or on yours, and change your channel to be as far as possible from other users' channels.
     
  3. occamsrazor

    occamsrazor Network Guru Member

    Interesting... can you elaborate on why AES is better/faster than TKIP? And what frameburst does? Thanks, Ben
     
  4. HennieM

    HennieM Network Guru Member

    AES uses single pass encryption, and hardware does most of the work. This "new" hardware, capable of doing the AES encryption on the fly, was a pre-requisite for WPA2 capable APs, adapters, etc. I.e., the CPU just "pushes" the raw data through a piece of hardware, and it comes out (de)encrypted on the other side. (It's not quite that simple, but it illustrates the concept).

    TKIP is a pseudo-equivalent of AES, providing close to the same level of encryption, but is all done in software; I.e., the CPU does the encryption, and multiple passes are required to get to the desired encryption state. It was developed to enable "old" hardware, which was designed for WEP, to enable use of the interim encryption and authentication scheme now known as WPA.

    Frameburst make it go fast.... ;)

    As I understand it, normal 802.11 protocol requires a send-a-frame, get-response, send-a-frame, get-response, .... type conversation.
    Frameburst denotes a sort of sub-conversation send-a-frame, send-a-frame, send-a-frame, ...then get-response. Dunno if I'm right, but that's how I see it, hence the name "bursting of frames".
     

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