Cannot connect with full speed.

  1.    05 Oct 2016 #1

    Cannot connect with full speed.


    The speed I have with my ISP is 100/30, this week they sent me an email telling me that I was upgraded for free for 200/30. Worked fine the first day then the connection went down to 100/30 again. (tested via and - wired tests from pc)

    I did a simple reset of the modem+router then things came back to normal (200/30). A couple of hours later it came back down to 100/30 again. Did the reboot process again, same thing. Works for a couple of minutes then it comes back down to 100. Now after a couple of resets, never goes up , 100/30 steady.

    Then I tried to connect the modem directly to the computer to see if the router was the culprit, my speeds are good and stable at 200/30.

    So I guess the Router is acting up. Then I updated the firmware, reset every settings and I have the same problem. Only setting I changed after the first test is that I disabled the firewall to be sure it was not messing around with anything.

    Called my ISP, the modem is fine as they can see. They told me to try to put the nic card at full duplex to see if it would help, nothing good came out of this.

    The router is a Asus RT-AC3100 with the latest firmware, never had any problems with it. Windows 10 pro x64

    I installed the latest Merlin firmware to see if it would change something, same problem.

    What would you do, I did all the tests I know about, maybe you guys have some black magic voodoo things I could try out ?

    Cables are all good, all Intel diagnostics for the nic card came out good also.

    Thanks !
    Last edited by madspec; 05 Oct 2016 at 10:17.
      My ComputerSystem Spec

  2. bro67's Avatar
    Posts : 5,559
    Mac OS High Sierra 10.14.3 Beta (18D21c)
       05 Oct 2016 #2

    Make sure that you are using both 2.4ghz with 40mhz Channel Bandwidth and 5ghz along with 80mhz Channel Bandwidth. If your adapter on your computer is not Wireless AC capable, it will try and use Wireless N.

    It is possible that your modem is not able to handle the upgraded profile or they may not have sent it to your modem, due to line issues. If your Modem see's any kind of line problems, it will downgrade to the next lowest speed until it is able to keep a stable connection.
      My ComputerSystem Spec

  3.    05 Oct 2016 #3

    All my tests are done wired, not wireless. And like I said, if I unplug my router and only use the modem, I get my full speed of 200/30.
      My ComputerSystem Spec

  4. bro67's Avatar
    Posts : 5,559
    Mac OS High Sierra 10.14.3 Beta (18D21c)
       06 Oct 2016 #4

    madspec said: View Post
    All my tests are done wired, not wireless. And like I said, if I unplug my router and only use the modem, I get my full speed of 200/30.
    It does not matter how you tested your speeds. Speed tests have always been inaccurate. They are like looking at Google Maps to see how traffic is, which you think is going to be no issues, then when you get on the road it is slower than snot.

    If you know that your router is the culprit, the solution is to buy a new router that can handle the higher Wan to Lan speeds. I would suggest a good Wired Router with a separate Wireless Access Point. That will give you more flexibility in the long run. has the info you need to find a new Gateway with higher Wan to Lan speeds.
      My ComputerSystem Spec


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