User manual

CONFIGURATION
IPRS serial gateway User guide ref. 9018409-01 Page 37
The Internet Assigned Numbers Authority (IANA) controls the assignment
of IP multicast addresses.
The range of addresses from 224.0.1.0 through 238.255.255.255 are
called “globally scoped addresses”. They can be used to multicast data
between organizations and across the Internet.
The range of addresses from 239.0.0.0 through 239.255.255.255 contains
limited scope addresses or administratively scoped addresses. These are
defined by RFC 2365 to be constrained to a local group or organization.
Routers are typically configured with filters to prevent multicast traffic in
this address range from flowing outside an autonomous system (AS) or
any user-defined domain. Within an autonomous system or domain, the
limited scope address range can be further subdivided so those local
multicast boundaries can be defined. This also allows for address reuse
among these smaller domains.
Note This address range is only for the group address or destination
address of IP multicast traffic. The source address for multicast
datagrams is always the unicast source address.