- Assigned automatically as an IPv6 host comes online.
- Similar to the 169.254.x.x addresses of IPv4
- Always begins with “FE80” (First ten bits 1111 1110 10) followed by 54 bits of zeros.
- Last 64 bits is the 48-bit MAC address with “FFFE” squeezed in the middle.
- No subnet mask.
- The multicast group for the Link Local address is always the least significant 1:FF and then 24 bits of LL address.
Example:
MAC Address: AABB.CC00.0200
Link Local Address becomes: FE80::A8BB:CCFF:FE00:200 which expanded out becomes:
FE80:0000:0000:A8BBl:CCFF:FE00:2000
- 0xffee gets inserted between the two halves of the MAC address.
- The seventh bit (universal/local flag) gets set to 1.
