RE: [Manet-dt] Revivied discussion on MANET multicast addresses

Ian, 

> Now, I'd like to ask about creating a global ALL_MANET_ROUTERS or a
> range of global addresses that are used for dissemination of packets
> within the MANET between MANET Routers.
>
> How do people feel about a global ALL_MANET_ROUTERS or a range of
> global multicast addresses for us within a MANET?

To me, this would suggest a "site-local" scope for ALL_MANET_ROUTERS
if one considers an entire connected MANET as a "site". The IPv6
addressing architecture defines a site-local scope for multicast
(see: RFC4291, Section 2.7) and there is in fact an 'All Routers'
site-local multicast address already assigned in:

http://www.iana.org/assignments/ipv6-multicast-addresses

Unfortunately, things don't seem quite so clear-cut in IPv4.
(RFC3171, Section 3) seems to indicate that assignments
from the local network control block (224.0.0/24) must not
be forwarded at all (i.e., they are of link-local scope),
while assignments from other blocks appear to be of global
scope. I don't know if there is a way to allocate a
local/global-scoped IPv4 multicast and specify that it
is actually to be treated as site-local?

Fred
fred.l.templin@boeing.com  

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