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Weird bandwidth issue

Discussion in 'Tomato Firmware' started by draftvader, May 30, 2009.

  1. draftvader

    draftvader Addicted to LI Member

    Sorry to be non-specific with my title. I am not THAT experienced in wireless networking. Any answers, however, can be quite technical as I am a very experienced PC troubleshooter....just not networking :wink:

    OK. We are using Tomato on 2 out of our 3 Linksys WRT54G routers (I can't get to the 3rd one). Our set-up is quite simple with a cable modem feeding into #1, then #2 and #3 set as repeaters. We use the Robert "Robson" Mytkowski script to provide differing bandwidth allocation to our users. We release MAC addresses for internet access and use a WEP2 key to stop unwanted visitors.

    Recently I had noticed a drop in some bandwidth intermittently. I reset my modem, then my routers one by one. I contacted my ISP (useless...we are in Bangkok) and they told me that it was not a problem at their end. Banging my head against a wall I thought I would wait out this issue.

    Last night we had a power outage and upon the power being restored I noticed that my international bandwidth had restored. This morning I watched it die again. I thought I would do a reset, but nothing changed. I went into Tomato admin and did a reboot, now everything is better, but I am seeing massively fluctuating bandwidth whilst using Rapidshare (I am a premium user, so there is no throttling on my account). Normally my CFosSpeed shows a steady 220-250kbps, but now it is varying between 40-220kbps. Is there something in my setup that could affect this?

    I am happy to provide any information requested to make sure it is not a problem with my router so that I can confidently throw things at my ISP. If it is a problem with my router set-up I would love to learn what I am doing wrong.

    Sorry about the length, I just wanted to explain the routers behaviour to see whether anybody else had suffered similar or knew what the problem was.
  2. Toastman

    Toastman Super Moderator Staff Member Member

    Are you using True, or TOT?

    TOT have been giving problems like this for years, and none of their technical staff seem to have any idea what they are doing. Recently, according to friends, it has been getting even worse.

    Some Zyxel ADSL modems supplied by TRUE as freebies exhibit this behavior in bridge mode. Reducing MTU fixes the problem.

    But you say you're on cable? So perhaps you have a different ISP altogether.
  3. draftvader

    draftvader Addicted to LI Member

    Thank you for your quick reply. Good forum. You obviously understand the situation in Thailand WELL!! Sorry, I didn't mention what my connection type was. We are on ADSL with TRUE. We have a Huawei modem. It is becoming clear that this is a combined issue. This morning I have done a reboot and we have full, steady, bandwidth. Rapidshare is producing a steady 220-248kbps...we'll see how long that lasts. We have an MTU of "Default 1492". What would be best for TRUE? (If you do know perhaps you can give TRUE a call and let them know...then they would know SOMETHING more than they do now!!).

    It sounds like a general ISP management issue in Thailand....hang on that should read ALL of Thailand. I always imagine a bunch of monkeys flicking random switches and the getting distracted...keeps me sane when I have lost the Mai Pen Rai!!!
  4. Toastman

    Toastman Super Moderator Staff Member Member

    The only reliable speedtest here in Thailand is http://speedtest.adslthailand.com - try that one. There is also a server in Singapore that gives good speeds, anywhere else is limited by the international gateways.

    You've just about got it right with the Thai issue, nobody really seems to understand anything here and they don't even care if it doesn't work properly. Anything more technical than a beer-bottle opener and they've lost it..

    Connection speeds to expect:

    2Mbps - 1.5 down 350 up
    4Mbps - 3.3 " "
    5Mbps - 4.4 " "

    If you're using rapidshare speed test in another country to check international speed, then what you have discribed sounds typical for Thailand. The international connections are inadequate and the speed varies wildly throughout the day.

    I do not know that modem, however anything that is supplied free here is usually crap. If the connection speed shown using adslthailand.com also varies wildly, max upload say 50 k then suspect the modem MTU is too high.
  5. draftvader

    draftvader Addicted to LI Member

    Thank you again for your information. I have now started to see a pattern that is emerging from my router. Again I watched the bandwidth drop last night, but couldn't reboot as it is a busy time online in our house. This morning I have done a reboot (through Tomato admin) and everything is back to normal. What could cause that to work? Could this be the signs of a dying router? In the interim period is there any way to set up an automatic reboot for the middle of the night?
  6. Toastman

    Toastman Super Moderator Staff Member Member

    Yes, in the Admin/Scripts/Scheduler section you'll see a function that will reboot your router.

    If your tomato is slowing down, you could try erasing NVRAM, then reconfiguring everything from scratch. If the problem still exists, perhaps try a different flavour of Tomato. Try using Victek's version, see if it helps.

    1492 MTU is OK for TRUE, it's the normal setting. However, the Zyxel router/modem that TRUE supply themselves doesn't work in bridged mode unless you set lower, just drop a few digits at a time. Probably that isn't your problem, though.

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