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rhosue21's avatar
rhosue21
Aspirant
Feb 22, 2022

Only getting ~400Mbps down on 1.2Gbps service with CM1150V Cable Modem and Nighthawk AC2600 (R7450)

I can't figure this out. I have a CM1150V Cable Modem and Nighthawk AC2600 / R7450 Wi-Fi Router and am only able to get a maximum of just over 400Mbps download speed. I have confirmed this using the ...
rhosue21's avatar
rhosue21
Aspirant
Feb 22, 2022

OK. I was hoping to avoid a factory reset because I've set up a lot of devices with reserved IP addresses. If I back up the configuration and restore it after the factory reset, would that potentially carry over any issues? 

I'll let you know what I see either way.

 

Thanks for the suggestions.

FURRYe38's avatar
FURRYe38
Guru - Experienced User
Feb 22, 2022

first try a reset with out the back up config file applied. 

  • rhosue21's avatar
    rhosue21
    Aspirant
    Feb 24, 2022

    So, I had some interesting findings.

     

    I connected my computer directly to the CM1150V cable modem and ran the Ookla Speedtest on several local servers. I discovered that most maxed out at ~400Mbps, but one gave me ~820Mbps... twice. After that, it then fell in line with all the other servers and maxed out at ~400Mbps.

     

    I then reconnected the router and got ~400Mbps through its built in speed test and slightly slower (~350Mbps) on the computer through its wired connection.

     

    Based on this, it looks like the problem is burried inside my CM1150V. I'd check the firmware, but that's all administered by my ISP.

     

    I'm stumped. I know the Cable wire is good because the tech from my ISP was able to get 1.2Gbps using his diagnostic tool. My CM1150V seems capable of the speeds, but only briefly. Is it possible that my link to my ISP is actually running at 1.2Gbps, but there is a bottleneck somewhere on my ISP's side of things that it limiting their speed to these testing servers?