sacrobert's profile

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Thursday, September 1st, 2022 2:05 AM

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Upgraded internet but now getting slower speeds than before

Yesterday I upgraded my speed from 600 to 1200. Before the upgrade O was averaging between 600-700 mbps, and now averaging 200-250ish. I've talked to multiple customer service reps with no luck. I've restarted the gateways several time in the 2 days and no luck. I've tested the wifi using 4 different devices all with roughly the same slower speeds. Any suggestions?

Contributor

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200 Messages

2 years ago

What equipment are you using?  Rented gateway, own modem + router, or own combo cable modem/WiFi router?  What models?

If you're using equipment that isn't approved for 1200 you can get results like this.  Comcast will only approve modems and combo units that have a 2.5Gb ethernet port for 1200.  If your device isn't approved it won't be configured correctly for 1200 and will basically end up in limp mode.  If you're using a DOCSIS 3.1 device that only has 1Gb ethernet ports and is approved for the 900 plan a 1200 plan likely won't get you 900.

If you're renting equipment I'd go ahead and have them swap out your gateway.  It's pretty much the first thing Comcast wants to try.

This kind of thing can happen with equipment that supports 1200.  I have a buggy MikroTik RB5009 router that did exactly what you're describing when I upgraded from 600 to 1200.  1Gb devices connected through the 10Gb port on the router (with a switch or two in between) would get ~250, so I had to rearrange my network a bit so all 1Gb or slower devices were connected through a 1Gb port on the RB5009.  Now I get ~1400 on 2.5Gb and 10Gb hosts and ~900 on 1Gb hosts.  WiFi maybe 600, but that's because of my cheap APs & all my WiFi clients being WiFi5/802.11ac.  I'm guessing this isn't your particular problem, but things like this can happen.  On that note, I should check for a RouterOS and firmware upgrade.  Maybe MikroTik will figure out how to fix it.

New Poster

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5 Messages

@zandor60657​ I rent from Xfinity. I have the XB7 gateway with max 2 5 gig throughput. Before upgrading my internet speed the gateway was fine but instantly after upgrading the plan it slowed to around 250 mbps. 

Contributor

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200 Messages

An XB7 should support that speed no problem, or at least get you 900-something if you plug a machine into it using a 1Gb ethernet port and match your old speed on WiFi.  I'd start with the gateway swap since Comcast is going to try to get you to try that anyway.  Hopefully you get an XB8.

It's also possible you have a signal/wiring/line problem.  Could you post the signal stats and error log from the XB7?  Be sure to redact and MAC addresses (CM-MAC, etc.) and routable IP addresses from the error log.  Comcast considers them personal private information and won't allow you to post them.  There's some info on getting the signal stats and error logs in this post:  https://forums.xfinity.com/conversations/your-home-network/internet-troubleshooting-tips/602dae4ac5375f08cde52ea0  Also it's best to cut and paste rather than take screen shots.  The forum does quite well with pasted tables.

Problem Solver

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606 Messages

 

@sacrobert That you for reaching out to us and allowing us to assist you. This is not the experience we want for you. Besides for the reset what troubleshooting have you completed?

 

I no longer work for Comcast.

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