On Thu, Mar 29, 2012 at 12:02 PM, Iljitsch van Beijnum <[email protected]>wrote:
> On 28 Mar 2012, at 12:08 , Fred Baker wrote: > > >> I haven't read the spec yet, but isn't PCP supposed to work in the > service provider run NAT64/CGN case, too? In that case, the multicasts need > to escape out of the site or even organization to reach the service > provider at least in the SOHO case. So this would be a scope just shy of > global, maybe a new "service provider" scope? > > > I personally rarely use "zero configuration" and "service provider" in > the same sentence... > > Am I understanding you correctly when I take that to mean that the admin > (value 4) scope is appropriate because then the people running the > multicast routing can determine exactly how far these packets travel? > > That makes sense, but there is one potential issue, that I think some > people who are well-steeped in IPv6 multicast should look at: in this > situation, the scope value 4 may need wider distribution than side-wide, > which is scope 5. I can't find any documentation on whether that's ok or > not between sessions right now, but I'm reluctant to assume that a lower > scope value can have wider distribution than a higher one without having a > spec that explicitly says so or hearing from some implementers. > > Correct me if I'm wrong, but isn't Admin Scoped multicast defined on a per- port, per-application basis? That would suggest that some multicast group addresses can (selectively) be forwarded through the CER uplink to the ISP. -K- Iljitsch > -------------------------------------------------------------------- > IETF IPv6 working group mailing list > [email protected] > Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 > -------------------------------------------------------------------- >
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