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For
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IP Address Traffic
System
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Purpose
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To select different multicast addresses.
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Value
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IP address
Guidelines
- IP multicast addresses, also known as group addresses, are in the class D range of 224.0.0.0 to 239.255.255.255 as defined by setting the first four high order bits to 1110.
In network prefix or Classless Inter-Domain Routing (
CIDR)
notation, IP multicast addresses are summarized as 224.0.0.0/4. Multicast addresses in the range 224.0.0.0 to 224.0.0.255 (224.0.0.0/24) are reserved for the local subnet and are not forwarded by IP routers regardless of the Time to Live (TTL) in the IP header.
- The IP multicast addresses from:
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224.0.1.0 to 238.255.255.255 are either reserved or assigned to a multicasting application.
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239.0.0.0 to 239.255.255.255 (239.0.0.0/8) are reserved for applications that can be administratively scoped.
- The following are examples of reserved IP multicast addresses:
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224.0.0.1–all hosts on this subnet.
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224.0.0.2–all routers on this subnet.
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224.0.0.5–Open Shortest Path First (OSPF) Version 2, designed to reach all OSPF routers on a network.
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224.0.0.6–OSPF Version 2, designed to reach all OSPF designated routers on a network.
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224.0.0.9–Routing Information Protocol (RIP) Version 2.
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224.0.1.1–Network Time Protocol.
For the latest list of reserved multicast addresses, visit the Information Sciences Institute web site.
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Default Value
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224.0.0.29
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CAUTION: If you change the address, make sure that you change it on all the machines, in order to insure that they will continue "talking" with each other.