A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Mobility Management and IP Multicast
Author(s) : A. O'Neill
Filename : draft-oneill-mip-multicast-00.txt
Pages : 20
Date : 25-Jul-02
Mobile IP provides a mobile node, that visits a foreign subnet, the ability to
continue to use an address from its home subnet (the home address) as a source
address. This is achieved through the allocation of a Care of Address on the foreign
subnet that is used as the end-point of a redirection tunnel from a home agent on the
home subnet. Mobile IP in RFC 3220 states that when the mobile node originates
multicast traffic intended for the foreign multicast system, it can only do so by
first obtaining an IP address from the foreign subnet (a Collocated Care of Address)
and then using this address as the multicast source address. This is to ensure that
the source address will pass multicast routing reverse path forwarding checks.
This foreign multicast model is however extremely restrictive, and still very
problematic to multicast routing and applications when the mobile node regularly
changes foreign subnets, as is common in wireless systems. This is because the source
address continues to evolve which must be tracked by source specific multicast
application and routing signalling. Using the home multicast system, again described
above, is also non-optimal because the mobile node receiver is then serviced by
packets that must be tunnelled from its home agent which, removes any multicast
routing benefits (ie network based tree building). This draft therefore describes
modifications to the foreign multicast interface between mobile IP and multicast
routing that enable the mobile node to use its persistent home address as a multicast
source address.
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