This issue has already consumer hours of my time and has forced me to get an advanced education in routers and modems that I never wanted. When I stand next to my router on 5G bands, I should be able to get something close to the 600Mbps I am paying for, but I can only get a max of 150-280Mbps (using multiple speed test sites). Not bad, but nowhere near where it should be. When the Xfinity techs plug in their own Gateway modem/router, low and behold they get 450-580. Something is up.
I've done ALL the standard procedures (power cycling, ordering, replacing Cat5 with Cat6, checking power adapters, etc.)
My house is a brand new construction (2020), so I doubt it's a cable. We don't have TV, so there is no cable splitting. Techs confirmed I'm getting "beautiful" signals to the house, and they have no issues with their modem/router, so I have to think it's my modem.
My modem is a recommended model per Xfinity. CM1000 Docsis 3.1. It's speaking fine with the router, which is an R7000 Nighthawk (AC1900). Again, more than capable of handling the speeds. All firmeware is up to date, per the Netgear techs.
Some irregularities I've noticed:
At this point, I'm thinking new modem, new router, or both. But I just bought this setup so I would hate to giveup on it too easily. Any advice would be stupendous. Thanks
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Thanks for the reply.
Yes, I've run several speedtests at different times of the day. When I'm plugged directly into the modem, I achieve speeds of 100Mbps or less. Same thing when I'm plugged into the router. When I use Wifi, I can get 150-280Mbps.
@banjo_viking wrote: ... My log keeps throwing a dynamic range window violation code ...
Please post the complete error log.
You may be able to check the laptop's Ethernet adapter speed by checking its device characteristics. If it's running Windows, you can do that in Device Manager / Network adapters.