Thomas Narten wrote:
>
> > If plen = 0, then isn't the "network prefix" portion 0 bits long?
>
> That would be one interpretation. Another possibly would be that the
> network prefix should have special meaning, other than looking at the
> first plen bits. I guess I'm asking if it would make sense to do so,
> for (say) debugging purposes.
The problem is that SSM requires all 128-bits to represent the source.
So, it seems simpler to indicate in some manner that the destination
multicast address is SSM and refer to the source address to determine
the "owner".
>
> > The SSM range should be FF3x::/12 (and this is mentioned in the SSM
> > overview doc today).
>
> draft-holbrook-ssm-arch-02.txt talks about reserving ff3x and ff2x for
> SSM.
I believe that this draft is in the process of being revised prior to
a last call.
>
> draft-ietf-ssm-overview-01.txt says:
>
> > Source-Specific Multicast (SSM) : This is the multicast service model
> > defined in [SSM-ARCH]. An IP datagram is transmitted by a source S to
> > an SSM destination address G, and receivers can receive this datagram
> > by subscribing to channel (S,G). SSM is derived from EXPRESS [EXPRESS]
> > and supports one-to-many multicast.The address range 232/8 has been
> > assigned by IANA [IANA-ALLOC] for SSM service in IPv4. For IPv6, the
> > range FF3x::/12 is defined for SSM services [SSM-IPV6].
>
> But that range also covers the address that are defined in this
> document, including non-SSM addresses! (And it doesn't cover the plen
> field that defines whether the address is SSM or not!!) So things do
> not seem to be in sync.
So, since I am the common denominator between the two drafts, I must
claim responsibility. The SSM overview draft should state that
FF3x::/32 is the SSM range for IPv6.
Brian
--------------------------------------------------------------------
IETF IPng Working Group Mailing List
IPng Home Page: http://playground.sun.com/ipng
FTP archive: ftp://playground.sun.com/pub/ipng
Direct all administrative requests to [EMAIL PROTECTED]
--------------------------------------------------------------------
