Multicast & Anycast
Example: 43 ? NTP Servers
- FF01::43 ? All NTP servers on this node
- FF02::43 ? All NTP servers on this link
- FF05::43 ? All NTP servers in this site
- FF08::43 ? All NTP servers in this org.
- FF0F::43 ? All NTP servers in the Internet
Structure of Group ID:
- First 80 bits = zero (to avoid risk of group collision, because IP multicast mapping uses only 32 bits)