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t_wrex's profile

New Contributor

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5 Messages

Wednesday, August 6th, 2025

State of IPv6 prefix delegation functionality on current business modems

Hey folks, I'm just checking in to see what the latest state of IPv6 is on business class. I recall having a bear of a time getting IPv6 to work on a Technicolor gateway about 5 or 6 years ago, and have not had to configure IPv6 on a Comcast Business network since then, but might be doing so soon. Do the modems support prefix delegation of at least a /60? Is there any speculation that *gasp* true static IPv6 will ever be offered? Thanks in advance. (Also like that the pinned post is over a decade old here. I miss NetDog!)

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Official Employee

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78 Messages

1 month ago

@t_wrex

Thanks for reaching out to us , Xfinity business does support Ipv6. This link https://business.comcast.com/support/article/internet/comcast-business-internet-learn-about-ipv6/ is a great resopurce

New problem solver

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34 Messages

But you really don't, do you?  We are unable to setup our /56 statically, and have to rely on your DHCP PD for our subnets.  When those expire, we get new /64's.  Unacceptable.

New problem solver

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34 Messages

1 month ago

They do a /56, but don't allow us to setup our own routes.  We have to use their DHCP PD, we get /64's out of it and we have to deal with the rotating subnets.

There is a post here about setting everything up manually, but it doesn't stick, the cable modem will eventually stop routing packets to your network.  

I did a deep dive on that and concluded that if they would only accept and process a RA from our router properly it would work.  But they don't. 

Currently looking at finding another provider.