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Re: IPv6 broadband provisioning
On Fri, 28 Dec 2007, Iljitsch van Beijnum wrote:
On 28 dec 2007, at 15:50, Brzozowski, John wrote:
The first device under the control of the ISP, or at least a device
very low in the aggregation hierarchy, to intercepts router
advertisements from the ISP's IPv6 router and slightly modifies them:
it basically injects some bits that are particular to the customer/
line, so that every customer sees RAs with a prefix unique to them.
[jjmb] If I understand this correctly there will be a unique RA sent for
each subscriber? Assuming yes, I am not sure this is universally
applicable to all access networks. Additionally, I think we would require
some dynamic mechanism, perhaps via DHCPv6, to dynamically provide the data
to the route to facilitate configuration otherwise this would be very
complex from a management and operational point of view.
Yes, the subscibers all see different RAs. I see two ways to accomplish this:
either have the ISP router send out RAs and have a downstream device
intercept and modify them before the subscribers seee them, or have the
device in question generate the RA in the first place. The latter has the
advantage that this device can answer router solicitations so there is less
RA traffic upstream. However, in that case the device in question would need
to know all the information that goes into the RAs. This could of course be
distributed through DHCPv6 but also through other mechanisms but that
information may be sufficiently static that manual configuration isn't a
problem.
In my opinion if the ISP router send out RAs is easier to control - except
no ipv6 transparency possible in the broadband network as described in "
ISP IPv6 Deployment Scenarios in Broadband Access Networks".
These models are already described in the RFC 4779. What is the goal of
this discussion? It is clear that, The address alignments has to be
defined. What else?
Sorry for jumping in late in the discussion....
Janos Mohacsi
Network Engineer, Research Associate, Head of Network Planning and Projects
NIIF/HUNGARNET, HUNGARY
Key 70EF9882: DEC2 C685 1ED4 C95A 145F 4300 6F64 7B00 70EF 9882