Dual stack hotspot/captive portal

[Darren Pilgrim]

On 2011-02-24 05:19, Jima wrote:
> On 02/24/2011 02:54 AM, Darren Pilgrim wrote:
>> On 2011-02-23 09:39, Ben Jencks wrote:
>>> Does anyone have experience setting up dual stack captive portal
>>> systems, e.g. for wireless hotspots? The difficulty is in tying the
>>> user's identity (as they log into the portal) to *all* of their IP
>>> addresses. With v4 it's easy, they only have one address and it's the
>>> one they use to log into the captive portal. With dual stack they
>>> have at least two: v4 and v6, plus possibly v6 privacy addresses that
>>> change over time.
>>
>> Embed two client-address-unique, correlated resources in the portal
>> page: one v4-only, one v6-only.  Dual-stack client loads the page,
>> accesses both, instant v4-v6 correlation.
>
>   ...as long as the client doesn't change their IP after authenticating
> to the portal page.

That's a problem inherent with captive portals in general.