Visitor
•
1 Message
Can residential Xfinity Internet be provisioned with a /60 IPv6 delegated prefix instead of a /64?
Hello,
I'm a residential Xfinity Internet customer in Minnesota using my own DOCSIS modem (Arris SB8200) and a router that supports native IPv6 using DHCPv6 Prefix Delegation.
Recently, after some apparent network maintenance in my area, both my IPv4 address and my IPv6 delegated prefix have changed twice within a short period. Everything is working correctly again, but it prompted me to look more closely at my IPv6 configuration.
Currently, Comcast is delegating a /64 IPv6 prefix to my router. From what I've been able to learn, many advanced routers are designed to work best with a /60 (or larger) delegated prefix because it allows the router to create multiple standard /64 LANs internally, which is how IPv6 was designed to operate.
I'm not trying to obtain additional public IPv4 addresses or business-class service. This is simply a question about IPv6 prefix delegation for a residential customer.
My questions are:
- Is it possible for a residential Xfinity Internet account to be provisioned with a /60 DHCPv6 delegated prefix instead of a /64?
- If so, is that something that can be requested for an individual account, or is the delegated prefix size fixed by the network serving my area?
Thank you for any information you can provide.
EG
Expert
•
121.9K Messages
2 months ago
https://forums.xfinity.com/conversations/your-home-network/is-it-possible-to-60-ipv6-block-instead-of-the-64-block/697c4d2a70934d00919560d4
0
0
user_wnclq1
Visitor
•
25 Messages
2 days ago
xfinity gives me a /60 via a prefix hint. I came here looking to see if I could get a /56 or /48 as I'm running out of /64s. But it doesn't look like there's much knowledge of ipv6 on this forum. Their servers do reject my /56 prefix hint.
5
0
user_wnclq1
Visitor
•
25 Messages
5 hours ago
I have no problems with my ipv6 settings or router. My question, and that of the OP, is how to ask xfinity for a larger ipv6 prefix. That is not something that my router vendor can help me with, that is an ISP configuration.
RFC 6177 recommends that end sites receive enough IPv6 space for multiple subnets and future growth, and specifically discusses /56 as a reasonable residential allocation. RFC 7368 states that /56 is highly preferable for home networks. Could you please provide a /56, or confirm whether /60 is a hard residential provisioning limit?
(edited)
2
0
BruceW
Gold Problem Solver
•
27.7K Messages
5 hours ago
That's not quite correct. As with all cable communications equipment, the device has to support the desired features, and then Comcast/Xfiity is responsible for making those features available to the customer.
Given compatible hardware, the details of IPv6 prefix delegation are up to Comcast/Xfinity.
0