Networking – Why can’t I get 100mbps via Linksys WRT1900AC router? Computer-to-gateway hardwired does 100mbps just fine, but router limits me to <12mBps

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My Comcast Xfinity gateway is a Technicolor TC8305C and I have it set to “bridge mode.”

If I hardwire my computer directly into the ethernet port on the back of the gateway, I get speedtests of >120mbps, no problem.

But if I insert my Linksys WRT1900AC into the loop—all wired connections—my speed tests drop to a max of 10-12mBps. This is not only from the computer but even from the router’s own software speedtest.

I have tried several different Cat5e cables between the router & gateway, with no change in numbers; while using the same cable from the computer-to-router that was working 100mbps on computer-directly-to-gateway.

I really need to use my own router for a whole variety of reasons, but I don’t want to give up 90% of my bandwidth! Am I missing some kind of router configuration setting?

Best Answer

Someone on the Linksys forums gave me the following solution, which worked. So I figured I’d post it here:

  1. I enabled “Media Prioritization.”
  2. On media prioritization page I clicked “settings” and set the “Downstream Bandwidth” to 120mbps exactly. I left all devices at “normal priority.”

And bam, everything started going 120mbps instead of 12mbps. Yay!

My only comment is: What a weird place to hide such a thing, and how bizarre to for a user to need to configure it manually to get the higher speed. Linksys probably ought to fix that.

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