networking - Router slowing down to a crawl

07
2014-07
  • Juanma

    Recently I upgraded my 2Mbps ADSL connection to a 6Mbps ADSL2+. Ever since this has been happening:

    After a router reset, the connection from modem to router is at a speed of 6Mbps for around 15 minutes, after that, I wouldn't get anything over 0.6Mbps.

    The connection from modem to a PC is at a speed of 6Mbps all the time.

    I use a LinkSys e1200v2, this started happening after the modem update; but there's no reason to blame the modem since direct connection (from modem to PC) is just fine, so I rebooted the router, again, good connection for 15 minutes, then the same problem happens again (connection speed drops to 0.6 Mbps).

    Then I changed the router's firmware to DD-WRT with the same problem, used another cheap Nexxt router with DD-WRT and got the same Problem.

    Some other things I've tried:

    1. Changed MTU size.
    2. Disabled QoS.
    3. Disabled Firewall.
    4. Set static DHCP.
    5. 30-30-30 reset.
    6. Physically removed the router away from possible electrostatic interference.

    Note: my router handles my public I.P. This problem happens to both wireless and wired connection.

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  • Juice

    I just signed up for service with Time Warner cable in Dallas, TX. I am supposed to get 7Mbps down w/ bursting to 10Mbps. If I connect the cable modem directly to my PC, I get the advertised speed. If I go through my router I rarely get above 2Mbps. I know its not my router because I went and bought two new routers, both different brands and the same issue occurs. I've also tried both of my laptops so I know its not the computer either. At this point I'm almost positive its their service. No router = fast, w/ router = slow. Has anyone had this issue?

    Currently I use a Linksys WRT54G w/ DD-WRT as my router with Windows 7. I've been using it for years without issue. If know one has any ideas I'll have to call CS and pretend I'm not using a router since their only fix is for me not to use a router which I find unacceptable.


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  • Juice

    Cloning my PC's MAC address instead of using the router MAC address fixed my speed issue.

  • Goyuix

    Some cable modems either require, or at least behave much better if you disable STP (DD-WRT Web Interface -> Setup Tab -> Basic Setup -> WAN Setup section). Also, I have seen the QoS settings wreak havoc on cable connections, as their "bursty" nature really doesn't play well. Disable any QoS on the router as well. Lastly, I find using dnsmasq on the router and having your computer use the private address (usually 192.168.1.1) as both gateway and DNS works best.

    More information: http://www.dd-wrt.com/wiki/index.php/STP

  • muncherelli

    If you're using DD-WRT on a router, you should look into flashing back to the default firmware of the router. It must be a setting within the router QoS.