Hi Tina, thanks for the pointers.
On the problem statement, you say: > It's has been adopted as MBONED WG item. The authors will submit the WG draft > soon. So I would normally expect the two documents (problem statement and normative spec) to go through as a cluster (if not the problem statement first). Given the difference in advancement, that may be difficult to achieve, though; if that is not possible, the spec will need to provide some context by itself. > http://datatracker.ietf.org/doc/draft-perreault-mboned-igmp-mld-translation/ This document reveals that the IPv4 multicast address embedded into the IPv6 multicast address is indeed used as such by applications on the other side of the mapper (5.2.4). My main comment is that the mboned-64-multicast-address-format document does not even hint that this might be the case, much less defines semantics that might be used by an application on the IPv6 side (and there have been other comments that applications are not even involved on the IPv6 side, which doesn't quite seem to mesh with this document). > http://datatracker.ietf.org/doc/draft-taylor-pim-v4v6-translation/ The latter is very clear in saying If an IPv6 group address to be translated matches the format specified in that document for an IPv4-embedded IPv6 ASM or SSM group address, the corresponding IPv4 group address MUST be obtained by extracting the low-order 32 bits from the IPv6 address. (The value of the sub- group-id field is irrelevant to this procedure.) So that supports my conjecture that the following is a strong, unstated requirement on the format document: It MUST be possible to determine, by looking at a packet, whether the destination IP address in there is matching the format or not. This places an even stronger burden on the completeness of the specification than I initially thought. I would address this by describing the algorithm that gets used to determine whether there is a match by looking at the packet. (The fact that I cannot determine this algorithm even by educated guessing is my other main comment.) Grüße, Carsten -------------------------------------------------------------------- IETF IPv6 working group mailing list ipv6@ietf.org Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
