[BB #227] Add RFC 6603 "Prefix Exclude Option for DHCPv6" support for Verizon Fios IPv6

[xixix-ft]

Ref. https://bitbucket.org/pedro311/freshtomato-arm/issues/227/add-rfc-6603-prefix-exclude-option-for

zcshiner created an issue 2022-06-25

Verizon has started their IPv6 deployment in earnest and is using a weird deployment strategy. They’re implementing RFC 6603 and so a WAN IP address isn’t assigned via DHCPv6 but constructed from one of the delegated prefixes.

Right now with IPv6 support enabled, and “Request PD Only” checked, my devices connect as they should -- 10/10 on test-ipv6.com. The missing part is that the WAN interface only has a link-local address. So no remote connectivity to the router over IPv6. Can we add a support for assigning a v6 IP to the WAN interface from the identified prefix?

There’s some ongoing chatter in the DSLR forums that I want to link for reference. Looks like Verizon is excluding the highest delegated prefix ID. https://www.dslreports.com/forum/r33416085-

Thanks!
Comments (1)

Jeremiah Toth (Jay)

+1 for an option such as this as well! For reference / info, someone created a script for pfsense that does this. It is hooking into the dhcp6c and iapd processes and setting the WAN IPv6 address to be the “Prefix Delegation + FF::1” so if you have 2600:4040:ABCD:12/56 as your PD, the fios router and, with this script, pfsense will set 2600:4040:ABCD:12FF::1 as your WAN ipv6 GUA. Basically the fios router just takes the very last of the 256 LAN /64s you have (FF) and dedicates it to the WAN.

More info:

https://forum.netgate.com/topic/174980/fios-getting-56-pd-via-dhcp6-but-no-v6-is-assigned-to-wan

https://github.com/luckman212/assign-gua-from-iapd
    2022-12-26