Basic HTML version of Foils prepared Dec. 6 98

Foil 45 IP Multicast (2)

From Introduction to Network Security Lectures at Xi'an Jaotong University -- Sept 1998. by Roman Markowski
1 multicast must be enabled on hosts and routers. If multicast is not supported, we have to built a tunnel i.e. encapsulate multicast messages in unicast datagrams
2 IGMP - Internet Group Membership Protocol (RFC 1112) used to dynamically register hosts in a multicast group with a class D address
3 IP multicast routing protocols (communication between routers):
  • MOSPF - Multicast Open Shortest Path First (3Com) - multicast routing protocol; extension of OSPF; uses unicast routing protocol; MOSPF calculates routes from the source to all possible group members for a particular group; works only in inter-networks that use OSPF; optimized for small number of active sources
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