Connection drops every two minutes for 30-40 seconds

Discussion in 'Tomato Firmware' started by chrisbliss18, Jul 10, 2009.

  1. chrisbliss18

    chrisbliss18 Guest

    I set up Tomato at home on my WRT54GL. I was so pleased with it, that I had my boss get a WRT54GL (v1.1) to set up in the office so I could use the QoS settings to ensure that our Vonage and SSH connections were stable.

    I set everything up today, yet I have a horrible problem. Roughly every 2-2.5 minutes, my computer completely loses all connectivity: DNS, HTTP, SSH, pings, everything. At these times, I can't even reach the router, nothing works. This is extremely consistent as I watched the connection for over half an hour and saw it consistently drop around every two minutes. Each of these drops lasts for roughly 30-40 seconds. Oddly enough, my machine never says that it loses the network connection; rather, it just seems like the computer is neither able to send nor receive any data.

    Eventually, I tested other machines and found the same thing. At the same time my machine would lose throughput, so would the others.

    I figured that QoS may be the culprit, so I disabled it. No change.

    I turned off as many services on the router as I could - SSH, Telnet, logging, QoS, wireless, and time sync. This did not make a difference.

    I used a variety of different traffic-generating applications in different combinations: torrents, SSH uploads/downloads, HTTP uploads/downloads, and no traffic except for pings. No matter what the traffic sources/destinations were or how densely the connection was being used, the same pattern of throughput drops would occur.

    I monitored the router from both the web access and SSH, and the free memory was consistently high (more than 70% free), connections never went higher than about 400, and the load was always below .1. Of course, when the connection dropped, I wasn't getting updates (SSH would just freeze), but before a drop and after a drop, none of the numbers looked inflated.

    Oddly enough, with QoS on, the Vonage line is the one exception. Even when no traffic can flow through my machine during a drop, the Vonage line is clear as a bell.

    Anyone have any ideas as to 1) what may be the problem and 2) what I can do to fix it? Oh, and thank you to anyone willing to read my lengthy description. :)
  2. Toastman

    Toastman Super Moderator Staff Member Member

    Firstly, not seen this particular problem so just grasping at the usual straws. I would copy all your configuration data somewhere, or print it, and, erase NVRAM and then copy it all back by hand (not using restore). That usually cures many weird problems which can't be explained.

    My next suspect would actually be the ISP. But by the time you've tried this, there will be some other posts on here with more suggestions.
  3. rhester72

    rhester72 Network Guru Member

    If he can't ping the router, it's not the ISP.

  4. Toastman

    Toastman Super Moderator Staff Member Member

    You're right, missed that comment. Apologies!
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