its_ns_04
asked on
multicasting
Hi,
Say if I want to multicast some data to a group of IPs, what will be the destination address in my IP field for such packets ?
For unicast, the destination address will be the IP of the destination and for broadcast, it will be the network address, it will be 255.255.255.255...how about in the case of multicast packet ?
How multicast works ???
Say if I want to multicast some data to a group of IPs, what will be the destination address in my IP field for such packets ?
For unicast, the destination address will be the IP of the destination and for broadcast, it will be the network address, it will be 255.255.255.255...how about in the case of multicast packet ?
How multicast works ???
ASKER
The how to link which you have mentioned doesn't say what to what addresses the machine will send packets to..
It simply says on configuring multicasting....
I am looking for something like, if i need to send some message to a group of address such as 192.168.1.3, 192.168.1.8,192.168.1.30.1 92.168.4.5 , how does it send ???
It simply says on configuring multicasting....
I am looking for something like, if i need to send some message to a group of address such as 192.168.1.3, 192.168.1.8,192.168.1.30.1
ASKER CERTIFIED SOLUTION
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Initially communication begins via unicast to the source, once the receiver and the devices in between join the appropriate group and build the multicast trees, the traffic is then directed to the source group IP. The group IP can be any address out of the reservered Mulicast IP, here is a link for best pratices assigning multicast addresses and thier approriate ranges.
http://tools.ietf.org/html/rfc3171
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http://tools.ietf.org/html/rfc3171
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it_ns_04,
Do you understand what the experts are telling you? Multicast addresses are assigned if you want them to be global. EIGRP uses a multicast address, for example, and it's published. If you write an application that uses multicast, you could apply for an address that your application would "own".
Here are some you may recognize:
224.0.0.0 Base address (reserved)
224.0.0.1 The All Hosts multicast group addresses all hosts on the same network segment.
224.0.0.2 The All Routers multicast group addresses all routers on the same network segment.
224.0.0.5 The Open Shortest Path First (OSPF) AllSPFRouters address is used to send Hello packets to all OSPF routers on a network segment.
224.0.0.6 The OSPF AllDRouters address is used to send OSPF routing information to designated routers on a network segment.
224.0.0.9 The Routing Information Protocol (RIP) version 2 group address is used to send routing information to all RIP2-aware routers on a network segment.
224.0.0.10 The Enhanced Interior Gateway Routing Protocol (EIGRP) group address is used to send routing information to all EIGRP routers on a network segment.
224.0.0.13 Protocol Independent Multicast (PIM) Version 2
224.0.0.18 Virtual Router Redundancy Protocol (VRRP)
224.0.0.19 - 21 IS-IS over IP
224.0.0.22 Internet Group Management Protocol (IGMP) Version 3
224.0.0.102 Hot Standby Router Protocol Version 2
224.0.0.251 Multicast DNS (mDNS) address
224.0.0.252 Link-local Multicast Name Resolution (LLMNR) address
224.0.1.41 H.323 Gatekeeper discovery address
Good luck
Steve
Do you understand what the experts are telling you? Multicast addresses are assigned if you want them to be global. EIGRP uses a multicast address, for example, and it's published. If you write an application that uses multicast, you could apply for an address that your application would "own".
Here are some you may recognize:
224.0.0.0 Base address (reserved)
224.0.0.1 The All Hosts multicast group addresses all hosts on the same network segment.
224.0.0.2 The All Routers multicast group addresses all routers on the same network segment.
224.0.0.5 The Open Shortest Path First (OSPF) AllSPFRouters address is used to send Hello packets to all OSPF routers on a network segment.
224.0.0.6 The OSPF AllDRouters address is used to send OSPF routing information to designated routers on a network segment.
224.0.0.9 The Routing Information Protocol (RIP) version 2 group address is used to send routing information to all RIP2-aware routers on a network segment.
224.0.0.10 The Enhanced Interior Gateway Routing Protocol (EIGRP) group address is used to send routing information to all EIGRP routers on a network segment.
224.0.0.13 Protocol Independent Multicast (PIM) Version 2
224.0.0.18 Virtual Router Redundancy Protocol (VRRP)
224.0.0.19 - 21 IS-IS over IP
224.0.0.22 Internet Group Management Protocol (IGMP) Version 3
224.0.0.102 Hot Standby Router Protocol Version 2
224.0.0.251 Multicast DNS (mDNS) address
224.0.0.252 Link-local Multicast Name Resolution (LLMNR) address
224.0.1.41 H.323 Gatekeeper discovery address
Good luck
Steve
This link should help: http://tldp.org/HOWTO/Multicast-HOWTO.html