On 21-Dec-2005, at 22:40, Tony Wicks wrote:
UBS is Layer 3 between the ISP and Telecom, but effectively the L2TP tunnel creates a layer2 link between the customer and the ISP's LNS. So theoretically I would have thought it could support v6 without a problem. The question however is why ? and to where would the v6 packets actually transit.
There's more v6 content available than most people realise (although this currently matters very little to anybody, since the same content is usually available faster over v4). There is a commercial v6 Internet alive today, and it works, though. It's not imaginary. If anybody is still lacking native v6 transit from their upstreams, then ISC is still very happy to terminate tunnels for them in Palo Alto for transit (and I believe Citylink will happily terminate corresponding tunnels on the v6ix, which gives you access to other similarly-connected people, plus anybody who cares to do native v6 on the WIX or APE). However, I'm still interested in the v6 DSL access question. If it works down there the way it works up here, then the L2TP session isn't established between the ISP's LNS and a customer device, but rather between the ISP's LNS and a tunnel switch within Telecom's network that also terminates the PPPoA or PPPoE session from the customer. If that's right, then unless that tunnel switch is spectacularly transparent with respect to encapsulated frame (and maybe it is) then some explicit v6 support seems like it is required within Telecom's network for v6 customer access to work. Of course someone with spare time could just try this out and answer the question authoritatively by telling me that they just tried it, and it works :-) Joe