Visitor
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2 Messages
Is the xb8 modem limited to 1gb on port 4- April 2023?
Despite everyone knows the public info that says port 4 is up to 2.5gbs, xfinity has a major issue on its hands.
I’ve been calling xfinity for 6 weeks now. I have multi gig service, xb8 modem, but all 4x ports on the modem are limited to 1gb when I login into the admin portal and look under LAN connection to test each port. I had a tech test the physical line connection, run a new coax line to the house, swap the modem to another xb8.
The issue is somehow on the backend configuration where xfinity is limiting the connection to 1gb but no one can fix it. Xfinity tech support is 5-6 hours on the phone multiple times and they are lost. Please help.
flatlander3
Problem Solver
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1.5K Messages
2 years ago
Only one port on the XB8 is 2.5Gbps. The other ports are 10/100/1000Mbps. This is not software configuration, this is a physical hardware limitation of those ports.
If you have multi gig service, you do not get an independent multi-gig service on each port of the gateway at the same time. The "up to Speed" itself is a theoretical calculation based on the number of bonded channels combined at the same time on the coax WAN connection. Similarly, your multi-gig service is all of your network traffic bandwidth combined on the LAN side.
If you want your devices that do have 2.5Gbps ports to connect at that speed, so you can transfer data between them locally at that speed, then buy a 2.5Gbps switch. Connect devices to that. Connect the switch to the orange/red stripe port on your gateway.
If you connect a single device with a 2.5Gbps port, to the 2.5Gbps port on the gateway, and run a speed test and you are only getting around 980 Mbps (1Gbps minus driver/os overhead), you've got a driver issue with your device 2.5Gbps port on the device. Make sure you enable 2.5Gbps in the network settings for the driver.
Will you ever see 2.5Gbps between you and a random website or streaming service? No. You will not. Everyone is doing load balancing and there is a limitation with everything between you and them. Buying increased bandwidth just means more clients can access data up to 2.5Gbps TOTAL data transfer (hardware limitation of that port, if you have that service). Doesn't mean your Netflix will be "more better". 4K video only pulls around 25Mbps anyway.
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