nnbnbI don't know the ins and outs of it but you cannot assign a multicast address in the way you would assign a standard IP address. Simply, there is a class problem and the multicast ranges live in Class D. Thats not how multicasts are used.
Dependant on the application, the multicast uses different IP addresses which the application on the device will then respond to when it hears it on the wire.
A good example of this is the address 224.0.0.1 which is a multicast address that means all hosts in this broadcast domain please respond. If you have a packet sniffer and a network with several devices you can ping 224.0.0.1 and see all hosts responding to the ping even though the actual ping output will show only one reply. Similarly, 224.0.0.5 corresponds to all routers running OSPF within your network which I think is how OSPF communicates. 224.0.0.10 = IGRP Routers, 224.0.0.12 = DHCP, etc, etc.
You can find out more information here :
www.cisco.com/en/US/tech/tk828/technolog...186a00802d4643.shtml
- Make sure you are sitting down for this link. :twisted:
As I said, I am not up on all the details of multicast yet but just letting you get the idea of how multicast works.
