RE: Reserved addresses in the SSM range

["Dr. Carsten Bormann" <cabo@tzi.org>]

> For example, we could
> modify RTCP such that responses to RTP streams sent to an SSM address
> would be directed to the sender instead of the group.

Just remember that the RTCP receiver reporting algorithms depend on seeing
every other report to gauge the group size and adjust the reporting
bandwidth appropriately (see section 6.2 of RFC1889 or, better,
draft-ietf-avt-rtp-new-08.txt).
RTCP currently has no way to reflect this information back from the sender
(which is the only one who will have it if RTCP is unicast).
For NORM (NAK oriented reliable multicast, rmt working group), we will
probably put a sender-based group size estimation scheme into the protocol
to make this work.

Gruesse, Carsten