QoS Puzzle

Discussion in 'HyperWRT Firmware' started by geekjock, Apr 9, 2006.

  1. geekjock

    geekjock Network Guru Member

    I have two v3 WRT54G's - one at my house, one at my girlfriends. I installed Hyperwrt Tofu 13c on both. At my place I have a Surfboard SB5100 modem, to the router, which connects to a Vonage adapter, two PCs and a TiVo. I use the Hyperwrt QoS to prioritize the VOIP adapter. This works perfectly, even through heavy uploads and bittorrent traffic.

    My girlfriend has a similar setup, except that her modem is an old RCA DCM105, and uses a VoicePulse SPA-2002 VOIP adapter.

    We both have Charter 3/256 cable, with acceptable upload and download rates, based on various tests.

    Despite having the same modem, with the same firmware and settings, I cannot get QoS to work properly on her setup. Uploads invariably cause jittering on the other person's phone.

    I have also tried Thibor 14, which makes no difference. I have been careful to do factory resets and to clear NVRAM before and after flashing firmware.

    Naturally I have read very carefully all information about proper implementation of QoS, and have tried numerous different settings.

    Does anyone have any ideas? I am willing to try your suggestions.
  2. Toxic

    Toxic Administrator Staff Member

    well you have proved one thing. it is not the WRT54G at fault. i guess the other hardware is.
  3. NateHoy

    NateHoy Network Guru Member

    One of the most important pieces of information QoS needs is your upstream bandwidth available.

    If this is not calculating properly (which, for example, it does not for me), your router may think it has far more upstream bandwidth than it really has, and this could make QoS ineffective.

    Turn off QoS for a while on the router, then run a badnwidth test on a quiet Internet connection. Turn QoS back on, switch the upstream bandwidth to MANUAL, and enter 90% of the tested upstream bandwidth in kbps into the provided field. Try that out and see if it helps. If not, keep lowering the number in increments of about 5kbps until it works.
  4. NateHoy

    NateHoy Network Guru Member

  5. geekjock

    geekjock Network Guru Member

    Upstream Bandwidth Setting


    Thanks for your input. I am familiar with your useful guides, and have previously used them with success.

    I have set my upstream bandwidth at 205 kbps, based on speed test results around 240 kbps for an advertised 256 kbps connection.

    Lower settings, down to 150 kbps, don't seem to make any difference.

    I've just noticed one difference between my setup and your guide: I have low and high ports set to medium, and you show them as default. I try changing the setting.
  6. NateHoy

    NateHoy Network Guru Member

    I had a LOT of problems with Thibor 14 and the "low and high" ports settings. In my case, they caused my connection to fail, and/or severely messed up QoS.

    I would most definitely set those to "default", if I were you. I need to start going through the code to truly understand the precedence, but I think that priority determination by TCP/IP Port is pretty high up on the list, likely higher than MAC address or Ethernet Port, so setting both to "Medium" may just be negating ALL of your other QoS settings.
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