Dynamic (changing) IPv6 prefix delegation

Tue Nov 22 15:55:57 UTC 2011

Hello,

On 11/21/11 16:21, Seth Mos wrote:
> Hello List,
>
> As a pfSense developer I recently ran into a test system that (actually)
> gets a IPv6 prefix from it's ISP. (Hurrah).
>
> What is bewildering to me is that each time the system establishes a new
> PPPoE session to the ISP they assign a different IPv6 prefix via
> delegation together with a differing IPv4 address for the WAN.
>
> Is this going to be forward for other consumer ISPs in the world?

I think it should be to option for the end users. Select if they want
stable IPv6 prefix or random IPv6 prefix.

> One of the thoughts that came to mind is T-Online in Germany that still
> disconnects it's (PPPoE) user base every 24 hours for a new random IP.

This is "kind of solution" for preserving IPv4 addresses.  Side effect
of the changing IP address is that user can be tracked back if ISP is
logging  the actual IP binding.

> Short of setting really short timers on the RA messages for the LAN I
> can see a multitude of complications for consumers in the long run.
>
> People that configure their NAS, Media Player and Printer on their own
> network. And using ULA for either is not workable unless they somehow
> manage to grow DNS skill on the end user. Their NAS probably wants to
> download from the 'net and access videos from the NAS. The media player
> wants to be able to access youtube and the laptop needs to (reliably)
> find it's printer each time.
>
> I really hope that ISPs will commit to assigning the same prefix to the
> same user on each successive connection.

Agree.
Kind Regards,
    Janos Mohacsi