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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