Slow wireless download speeds

Discussion in 'DD-WRT Firmware' started by Burrens, Jul 26, 2006.

  1. Burrens

    Burrens LI Guru Member

    I am using DD-WRT v23 SP1 final as my firmware on a WRT54GSv4. My wireless download speeds are significantly lower on a wireless connection vs. a wired connection on the same PC.

    For example, using the wireless connection my download speeds are around 1.5 ~ 1.9 Mbps versus around 4 ~ 4.5 Mbps when hard wired. My upload speeds of about 386 kbps remain the same when connected either wireless, or wired.

    Is anybody else experiencing this problem?
  2. Wireless102

    Wireless102 LI Guru Member

    i have the exact same problem, mine ranges around 4 Mb/s through the router
    and 10 Mb/s hooked straight to the cable modem.

    I have a large setup, the first router is hooked to the cable modem and i have a omni directional antenna on that router that transmits a quarter mile to another router in client bridged mode. if my pc is connected to the first router through a wireless conenction i can still get 10 Mb/s but after it goes through the second router i lose about half of the speed, upload stays the same at 1 mb/s
    i have tried everything i can find on google with no increase
  3. Disman_ca

    Disman_ca Super Moderator Staff Member Member

    Throughput is reliant on the wireless signal including strength and interference. The wired connection will always be faster. You could try changing the channel on the AP or re-positioning it if its in a confined space (under a desk or in a corner).
  4. kop48

    kop48 Network Guru Member

    Ok, in the second case, remember that when you bridge via wireless, you'll halve the available wireless bandwidth. There's a lot of factors that can affect wireless. The major one is obviously if there's any interference from any other wireless networks. Even though you've got separate channels on the Wireless G, they can still interfere with each other. Also, any wires between the AP and the client will cause interference as well.
  5. jgutz20

    jgutz20 Network Guru Member

    encryption is also going to eat up a chunk of the ethernet packet sizes as well
  6. Burrens

    Burrens LI Guru Member

    In my case I am literally no more than 5 feet from the router, and in the same room.

    I am using WPA with AES encryption. I will try an open network tomorrow, to see if it is the encryption that is causing the slow wireless speeds. If not, I will try different firmwares.

    I wonder why the upload speeds are not affected between wireless vs. wired?
  7. Toxic

    Toxic Administrator Staff Member

    have you checked the Articles section here on Signal tweaking?
  8. Burrens

    Burrens LI Guru Member

    I did read the article, and I will definately try changing the encryption to see if it helps my download speed. I did not change any other settings since, I am not experiencing any connection problems.

    I do have a question though. In the article it says that in Europe, channels 1,7, and 13 are unique. I am in the U.S., so for me only channels 1, 6, and 11 are unique right? If I were to use channels 7, or 13, I would get some overlap with the other channels?
  9. Toxic

    Toxic Administrator Staff Member

    The overlap of ANY channel is subject to other channels being used in the vacinity. you nieghbour for example could be on channel 1. you would need to be on 6 or highr to be clear of interference.

    the fact is 1,6,11 are the apart enough not to interfere with each other. if you look at the guide you will see the frequency chart this will show you if channels you are using are overlapping. (this would be used in wireless roaming)
  10. Burrens

    Burrens LI Guru Member

    Suppose I do a site survey, and I find that my neighbors are using channels 1, 6, and 11, if I choose either 7, or 13 I am in the clear right? It doesn't matter that I am in the U.S. correct?
  11. Toxic

    Toxic Administrator Staff Member

    As you see the frequencies of the 7 and 13 channels overlap 6 and 11. there is no way you could get around this problem.
    6 2426 - 2448 MHz
    7 2431 - 2453 MHz
    11 2451 - 2473 MHz
    12 2456 - 2478 MHz
    13 2461 - 2483 MHz

    the best bet is to find which of your neighbours has the weakest signal in your house. Then use a away from it slightly. channel 13 would be the better option as it is furtherest away without being interfered by any more that one other neighbour.
  12. Burrens

    Burrens LI Guru Member

    I see, thanks for the explanation Toxic. I still don't feel like I fully understand the overlapping logic, but I will leave it at that. I am using a channel (11), that none of my neighbors are using though.

    Back to the original problem. I know I was going to try to change the encryption settings to see if that is what is affecting the download speeds, but I jumped the gun and switched firmware instead.

    I loaded the latest HyperWRT Thibor build, and using the same encryption setting, my download speeds did improve to around 2.4 ~ 2.7 Mbps. Although an improvement, they do not match my wired connection's download speeds. Again, upload speeds are not affected.
  13. kop48

    kop48 Network Guru Member

    Ok, definitely try to turn off encryption and turn up the power of your antenna in the advanced wireless settings - just for minor security in case your neighbours are stupid, set the MAC address filter so that they can't connect unless they try REALLY hard. Also, what channels are used by your neightbours atm? I wasn't sure if that post before was theoretical or the actual fact.
  14. Toxic

    Toxic Administrator Staff Member

    and frame Burst is enabled? what TX Power setting are you using at present?
  15. Burrens

    Burrens LI Guru Member

    Frame Burst is enabled, and I am using TX power setting 50% (42 mW).
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