Residential subscribers: numbered or unnumbered?

[Tassos Chatzithomaoglou]

We do numbered: SLAAC for WAN (TR-069 is done over IPv6, although still fighting to make it work correctly in DS-Lite from all vendors) and DHCPv6-PD for LAN for all our PPPoE subscribers.

Recently we added the option of doing DHCPv6 for WAN too, since we found CPEs that do not behave gently to the BRAS/BNG if that's not the case.

--
Tassos

Philip Matthews wrote on 25/3/2014 19:29:
> Folks:
>
> Until recently, I was under the impression that most people were using numbered v6 links to residential subscribers, allocating the WAN address using DHCPv6.  However, recently two people have told me about a number of providers that are doing unnumbered instead.
>
> So for anyone who has deployed or is planning to deploy residential IPv6, I am curious to know which way you are going, and more importantly why you selected that approach? My interest is primarily in IPoE, but I don't mind hearing about PPPoE as well.
>
> The arguments I know or have heard for going numbered are:
> * Have a WAN address that one can ping remotely to verify connectivity (here I am assuming using DHCPv6 to assign a specific IID like ::1)
> * Want to use TR-069
>
> The arguments I can think of for going unnumbered are:
> * Greater security
> * Plan to ping the loopback address on the CPE
>
>
> Additional questions for those who have chosen the unnumbered approach or are using SLAAC to number the WAN address.
> * What are you doing wrt having an address to ping to confirm the CPE is reachable?
> * For those doing unnumbered, do all CPEs implement the same algorithm for selecting the loopback address according to WAA-7 in RFC 7084? If not, how do you handle this? For example, do you only select CPEs that implement the same algorithm? Do you just try the likely candidates until one works? Or something else?
>
>
> - Philip