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jybt
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Frequent Visitor

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11 Messages

Saturday, November 11th, 2023

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IPv6 Stopped working

I implemented IPv6 a year or so ago when it became available in my area.  It worked great.........until it didn't.  I didn't know that's what it was, only that my speed dropped recently from 800Mbps max to 250 Mpps max. Comcast Tech Support told me my Comcast Approved personally owned Arris SBV3203 router was malfunctioning, and I needed to buy a replacement.  But when I talked to my router manufacturer, they suggested I try switching from IPv6 to IPv4.   Most of the speed returned (about 500Mbps).  


I have heard on the forums that IPv6 may not be configured properly on some of the Comcast servers.  Is that what is happened? Is this something that can or will be fixed? Does Comcast no longer support this router that they did before?

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2 years ago

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XfinityPeterH

Official Employee

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2.4K Messages

2 years ago

@jybt thank you for your post and for letting us know what has happened. When it comes to 3rd party equipment, we can not guarantee service, but we can make sure that everything is correct and help troubleshoot with you. For an updated list of approved modems, you can click this. Please let us know if you need more help. :-) 

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jybt

Frequent Visitor

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11 Messages

That’s pretty much a non-answer.  

I have a Comcast approved router.  I want to understand why I had IPv6 service, and now I don’t.  

isn’t there someone at Comcast that can answer my question and fix the problem?

2 years ago

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XfinityAmira

Official Employee

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4.5K Messages

@jybt, we would be more than happy to get your account pulled up and take a further look into this for you. Please send us a Direct Message. Here are the detailed steps to direct message us: 
 • Click "Sign In" if necessary
 • Click the "Direct Message icon” (upper right corner of this page)
 • Click the "New message" (pencil and paper) icon
 • Type "Xfinity Support" in the To line and select "Xfinity Support" from the drop-down list
 • Type your message in the text area near the bottom of the window
 • Press Enter to send your message

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2 years ago

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