Problems with WRT54GS + HyperWRT GSv4 Thibor15c

Discussion in 'HyperWRT Firmware' started by individual61, Aug 1, 2006.

  1. individual61

    individual61 LI Guru Member

    Hi all.

    First of all, if there is any info that you need and I have missed, just ask and I will try to provide it.

    I own a WRT54GS Linksys router, serial CGN60...

    A few months ago I flashed it with HyperWRT GSv4 Thibor15c firmware off

    It has worked well, except for two issues.

    1) Firefox randomly tells me that the connection was reset when trying to load a page. This happens with about one in 20 page loads, and is not limited to any particular server. If I reload the page, there are no problems.

    2) More frustratingly, the internet connection drops out. The WiFi signal is fine, but there is no internet connectivity. My cable modem is an "ARRIS DOCSIS 1.1 / PacketCable 1.0 Touchstone Telephony Modem HW_REV: 32". The router is connected to the cable modem via ethernet. This happens about once a day now. It didn't happen previously, and I can't think of any changes that may have caused this.

    When this happens, if I try to ssh into the router, I will get a 30 second - 1 minute delay before the password prompt appears. The web interface generally loads quickly. In the status section of that page, everything seems fine. I have a normal IP address (200.x), the DNS servers are fine and so on, yet there is no connection to the outside world. Pinging does not work, but probably because the router will only ping IP addresses, I'm not sure if it does a DNS lookup for this.

    At times, though, the router is assigned (the cable modem is accessible on and there are no DNS servers listed in the status page.

    Sometimes this issue goes away on its own, sometimes I power cycle the router and press the reset button on the cable modem (can't power cycle it, it has a backup battery as it's also used for telephony). Eventually things go back to normal.

    Issue number 1) seems to me to be most certainly an issue with the router. Issue number 2) might have something to do with my ISP, but I thought I'd ask here, as they'd probably give a deep sigh if I told them that I was using a flashed wifi router.


  2. individual61

    individual61 LI Guru Member

    I should add that issue number 2) is most likely due to the ISP. I called them recently, and they said that the Signal to Noise ratio was too low, and they were sending someone out. It *has* rained a lot in the last few weeks, maybe there's physical damage to the cables.

    In case anyone is interested, the RF parameters are:

    Freq/Power: 621.000 MHz 0 dBmV
    Signal to Noise Ratio: 37 dB

    Issue 1) remains, however.

  3. Thibor

    Thibor Super Moderator Staff Member Member

    if you connection disappears briefly due to the s/n ratio disconnecting your internet, you'll get issue number 1)
    you could also try dropping your mtu value a little, perhaps that will help. your pc could have the dhcp being renewed at the time and would also cause issue number 1)
  4. individual61

    individual61 LI Guru Member

    Your point about issue number 1 makes sense, I hadn't thought of that.

    The MTU for the WiFi interface is set at 1500. I might have a go changing this if the technician does not find anything wrong with the line.

    How often does this firmware renew the client's DHCP lease? I assume you mean the router renewing the Mac's lease and not the cable modem/ISP renewing the router's lease.

    In any case, I'll post what the techie finds today.


  5. mstombs

    mstombs Network Guru Member

    That s:n ratio seems very healthy, but frequencies very different from those in use over here in UK.

    Can you see your upstream power? (your ISP will see the s:n at their end), high power means your modem is having trouble making itself heard, +58 or +61dB is maximum with ones I have seen
  6. individual61

    individual61 LI Guru Member

    Well, the techie came over and I was out, and only my mother was here. She said that the visit was "useless", that he checked the cables outside, but wouldn't say more until I got home. I'll ask tomorrow.

    Here's the data from the cable modem:

    RF Parameters
    Freq/Power: 621.000 MHz 1 dBmV
    Signal to Noise Ratio: 37 dB
    Modulation: QAM64
    Freq/Power: 36.900 MHz 50 dBmV
    Channel Type: DOCSIS 1.x (TDMA)
    Symbol Rate: 2560 kSym/sec
    Modulation: QAM16
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