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Help Me! -- WDS / Bridge speeds goofy!

Discussion in 'Tomato Firmware' started by though, Jan 16, 2010.

  1. though

    though Network Guru Member

    help please-

    i just set up a WDS system with 4 buildings.... 2 of them are connected via WDS to each other while the other 2 buildings bridge to the secondary WDS unit (see picture below). the connection is solid, no packet loss, everything seems to be great except 1 thing that i can't figure out.

    when i run torrents on the 3 units (other than my main router) i am getting speeds at around 2.0MB/sec, pretty close to the max speed of my cable modem. this is great, BUT when i try to download something using my browser, whether it's a speedtest, a service pack from microsoft, quicktime w/ itunes, etc, the speeds are VERY slow, around 200kB/s. if i download these from my pc that is on the main router, these downloads are FAST, around 2.0MB/sec just like the torrents.

    how come the torrents are fast like they should be on the secondary units, but 'regular' web downloading is not nearly as fast????
     

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  2. Disman_ca

    Disman_ca Super Moderator Staff Member Member

    Are you sure you are getting that throughput on all routers? Typically a bridged connection (including WDS) cuts the througput in half. The reason for this is every packet would have to be forwarded across the wireless bridge. In you case any device connected to AP 3 or 4 would have packets forwarded from AP 3 (or AP 4) to AP 2. Basically WDS is like a wireless relay using the same wireless path for transmit and recieve.
     
  3. though

    though Network Guru Member

    hey disman,

    thanks for the reply. i am absolutely sure. please check my screenshots....


     

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  4. though

    though Network Guru Member

    i used the DrTcp tool and changed the 'Tcp receive window' to 64000 and 128000. neither improved the download speeds for web stuff. i get 2+ MB/sec download speeds on the torrents with both settings. any other tricks/ideas ??
     
  5. mstombs

    mstombs Network Guru Member

    The TCP RWIN was a long shot, used to be a problem with folk who had optimized their connections for dial-up, but sometimes the defaults on wireless can be different to wired.
     
  6. Toastman

    Toastman Super Moderator Staff Member Member

    I agree with disman_ca here. I think your slow speeds are just due to the use of WDS. If access is fast at the router, and then slow as you move to the other locations reached by WDS, that would tend to confirm it. Since Torrents consist of multiple connections they would still be able to take most bandwidth while individual connections would be slowed right down due to the extra delays. A long time ago the previous owner of this building used WDS rather similar to your setup, and all of the residents had the same problem. In our case it was possible to lay cat5e cables, but it may not be for you. But get rid of as many WDS connections as you can.
     
  7. LanceMoreland

    LanceMoreland Network Guru Member

    I was able to keep WDS speeds up by having dedicated WRT54G's handle the WDS connections. A second router was hardwired into the WDS routers to provide wireless connections to client computers. This keeps the WDS from splitting its time talking to the client and the other WDS unit. All you have to do is set the WDS units up with a unique SSID and choose WDS only. I have attached a diagram that better explains the setup.

    Lance
    www.lancemoreland.com
     

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  8. though

    though Network Guru Member

    that sucks. i figured if i can get rockin' torrent speeds, why would web speeds be any different :(
     
  9. Engineer

    Engineer Network Guru Member

    Do torrents stream in the raw or are they compressed (serious question as I don't know)?
     
  10. though

    though Network Guru Member

    raw. as far as i know...
     
  11. Toastman

    Toastman Super Moderator Staff Member Member

    though, Torrents consist of many connections. Say you have an ftp connection, and due to, say, WDS, packets are being dropped. The remote server backs off and resends the packet, after a few more dropped packets, the ftp download will become quite slow.

    Now consider a P2P connection. The same thing happens, and data transferred on that connection becomes slow. So your torrent client will now try to open up several more connections on that download, and any others you have open, to try to maintain the total download speed you selected. So the total download speed appears to be maintained.

    Lancemoreland has done the best he can in his situation, only one WDS link is in use, the rest are wired. If you can do something like that, it will probably help.
     
  12. LanceMoreland

    LanceMoreland Network Guru Member

    I have a 20 Mbs down and 3 Mbs up connection. I see no degradation of speed no mater which Access point I am connected to with the WDS points set up the way I have them.

    Lance
    www.lancemoreland.com
     

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