IP Multicast Group
Addresses
224.0.0.0239.255.255.255
Class D Address Space
High order bits of 1st Octet = 1110
TTL value defines scope
and limits distribution
IP multicast packet must
have TTL > interface TTL or it is discarded
values are: 0=host,
1=network, 32=same site, 64=same region, 128=same continent,
255=unrestricted
No longer recommended as a
reliable scoping mechanism