During the long co-existing period of IPv6 and IPv4, the
interoperation between IPv6 network and IPv4 network is essential.
Multicast services across IPv6 and IPv4 networks are also needed.
Besides the packet-based multicast translation mechanism, this
document describes a multicast proxy solution. The solution is a
multicast deployment for transition scenario. It does not propose
any new protocol or protocol modification/extension for multicast.
The multicast proxy is deployed at the border of IPv6/IPv4 networks.
It is mainly based on content
cache. Without packet-based translation, it acquires the content data
from IPvX network, caches the data, and multicasts the data in IPvY
network. It acts as a multicast leaf in the IPvX network where the
data source locates while acting as a multicast source in IPvY
network where the multicast client locates.