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Comcast Business IPv6

BruceGiles

OK, the more I learn about iPv6, the more confused I get. Comcast Business tells us on our account page that our IPv6 Delegated Prefix is a /56 that looks like:

2001:0db8:2468::/56

But when I turn on IPv6 on our Sophos UTM, it tells me this:

Native over External (WAN): xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx
Subnet: 2001:0db8:2468::/64
Delegated Prefix: 2001:0db8:2468:20::/59

Does that make sense? Note that the UTM tells me I have a /59, not a /56, for the delegated prefix. And if the delegated prefix starts with 2001:0db8:2468:20, then how can the subnet start with 2001:0db8:2468:0000 ?

If I want the UTM address on the IPv6 LAN to be the first address in the range, do I set the address to 2001:0db8:2468::1 with a netmask of /64, or 2001:0db8:2468::1 with a netmask of /56, or 2001:0db8:2468:20::1 with a netmask of /59? Or is it something else? I will admit that I've tried all three, but I haven't yet been successful in getting IPv6 to work on our network. Can anyone help?



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  • 0

    Replying to myself to correct an error in my previous message. If the /59 delegated prefix starts with 2001:0db8:2468:20, then the full fourth group in the address is "0020", not "2000", as in "2001:0db8:2468:0020::/59". Nonetheless, the assigned subnet of 2001:0db8:2468:0000::/64 is not within the range of the /59 delegated prefix. It is, however, within the range of the 2001:0db8:2468::/56 delegated prefix. So I still don't understand what's going on.

  • 0 in reply to BruceGiles

    The UTM appears to be reporting what it sees in the network responses spoken that would indicate that Comcast has setup your account incorrectly in their DHCP server.

    Ian

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