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Hello, SI International represents and contracts with DITO (DoD
IPv6 Transition Office) on a number of IPv6 issues. In this case we are
providing DITO with a white paper on IPv6 Inter-domain multicast address
assignments and issues/problems (expected or realized) regarding IPv6 multicast
implementations. To begin, I have gone over a number of RFCs (including RFC
3306, 3956, 3307, 2375, 4607, ID draft-ietf-mboned-ipv6-multicast-issues-02.txt
among others) but they are vague as to actual working implementation of
inter-domain multicast address assignments and how they will or might work proceed. I wrote to IANA and it was suggested I might contact the
IEFT MAGMA and PIM groups, so I am forwarding this letter; any advice is
greatly appreciated. =====my questions or issues ===== In IPv4 GLOP was developed but not widely used, where an
organizations ASN is embedded in the 223.0.0.0 / 8 multicast range. In
IPv6 I have seen V6UPBM (RFC 3306) and “Embedded RP” (RFC 3956) as
similar proposals for IPv6. However, I am still not clear of the “reality”
of IPv6 multicast address assignments especially with regards to globally
unique (by organization, domain, site, etc.) inter-domain multicast. That is, how far have actual address assignments
proceeded? What is just proposed versus being implemented or to be
implemented? Are there actual standards being followed? Are there any referential real-world implementations? Are there known/expected issues/problems with IPv6
inter-domain multicast and address assignments? Maybe a quote from my actual assignment will further clarify
what I am looking for: “DITO is having some concerns with IPv6 multicast
address space and how it should or should not be provisioned. You should
start the study with regards to how IPv4 multicast addressing worked in the
past. If you ever worked with it you would know there was never official
group reservations made with regards to address blocks. However, this was
never a real issue since its popularity died. So except for what was
deemed to be the well-known addresses there was never any reservations, unlike
how unicast is reserved. One thought might be the Army gets a block of
addresses, Navy, and so on.” =============== Again, any help is appreciated. Thanks, James Gibbons Senior Network Engineer SI International Tel: 703.234.6894 |
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