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dncn
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3 Messages

Monday, October 28th, 2024 10:54 PM

Ethernet limited to 100 Mbps

My gateway is getting 500Mbps, Wi-Fi devices can reach close to that speed, but my ethernet ports are locked at 100Mbps. My Windows PC has no wireless adapter, and I don't care to buy one because I shouldn't need to.

I have an XB6, both ports are Gigabit. They display flashing orange lights.

I'm using a 10' Cat5e cable, and I've tried using a different Cat5e. My motherboard has a GbE port.

Changing Speed & Duplex from Auto to 1.0 Gbps Full Duplex has no effect, other than briefly showing my link speed to be 1000Mbps in Windows settings, but when it actually connects to the network it changes to 100Mbps again.

I've done all this troubleshooting without a VPN.

I've got a headache trying to figure this out. Any help or possible solutions outside of the few I've mentioned is appreciated. Thanks in advance.

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2 months ago

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Accepted Solution

dncn

3 Messages

2 months ago

Whelp, the issue was apparently with the cables. I bought a Cat 6 cable today and the XB6 automatically switched to a 1Gb connection.

If you're having this issue and you're using a Cat 5e cable, get a Cat 6. It doesn't matter if a Cat 5e is theoretically adequate, it just won't work for some reason (in my case, of course. YMMV)

1

XfinityRay

Official Employee

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2.3K Messages

Thank you for sharing with the Community what worked for you, dncn! I am excited that the issue is resolved and that the speed is coming through now. We are here 7 days a week and are always glad to help with any concerns. Happy surfing! 

I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
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2 months ago

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user_sp54id

3 Messages

2 months ago

I am having the same issue with my 2000mbps, i was getting 2300 at some points and now it just wont go passed 940 mbps.  I've been looking at resolutions everywhere on trying to see what changed with my network but i cant seem to find what's wrong. Ive also changed my link speed to 2500 and changes automatically to 1000 when i took off the auto setting... so im on the same boat and get no answers from xfinity

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dncn

3 Messages

This topic has the only solution I haven't tried yet, which is getting a Cat 6 cable. I'm going to do that tomorrow. I assume you're using Cat 6 already with those speeds, but you could try a new cable I suppose.

At least someone shares my pain o7

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2 months ago

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user_sp54id

3 Messages

I have bought a new cable as well and still I'm capped at 1000 link speed, its just weird that i had no issues before and now all of a sudden I'm having lower speeds

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2 months ago

0

train_wreck

Contributor

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35 Messages

2.5Gb ethernet, in my experience, sometimes requires Cat6A cables, or at the least very well made and insulated Cat6 cables, for the most reliable experience. I have encountered unreliable connections that randomly drop down to 1Gb on some Cat6 cables, other times i've had no issues, it can depend on the devices connected to either end.

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2 months ago

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user_sp54id

3 Messages

Yeah thing is i never had this issue before and have cat6 cable my internet just started doing this so i know its nothing on my end

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2 months ago

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