Multicast and Other Special IPv6 Addresses
Multicast
IPv6 supports multicasts on behalf of applications and multicasts to support the inner workings of IPv6. To aid this process, IPv6 defines ranges of IPv6 addresses and an associated scope, with the scope defining how far away from the source of the packet the network should forward a multicast.
All IPv6 multicast addresses begin with FF00::/8. In other words, they begin with FF as their first two digits. Multicasts with a link-local scope, like most of the multicast addresses referenced in this chapter, begin with FF02::/16; the 2 in the fourth hex digit identifies the scope as link-local. A ...
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