The IPv6 Link-local address is derived form the MAC- or Ethernet hardware address in the following way;
| Mac address: | XX:XX:XX:XX:XX:XX |
| IPv6 Link local address: | fe80::xyxx:xxff:fexx:xxxx |
Where y = X XOR 2. Furthermore ‘ff:fe’ is inserted and ‘fe80::’ prepended.
‘y = X XOR 2’ means inverting the 2nd bit from the right;
| X bin | X Hex | y bin | y Hex |
|---|---|---|---|
| 0000 | 0 | 0010 | 2 |
| 0001 | 1 | 0011 | 3 |
| 0010 | 2 | 0000 | 0 |
| 0011 | 3 | 0001 | 1 |
| 0100 | 4 | 0110 | 6 |
| 0101 | 5 | 0111 | 7 |
| 0110 | 6 | 0100 | 4 |
| 0111 | 7 | 0101 | 5 |
| 1000 | 8 | 1010 | a |
| 1001 | 9 | 1011 | b |
| 1010 | A | 1000 | 8 |
| 1011 | B | 1001 | 9 |
| 1100 | C | 1110 | e |
| 1101 | D | 1111 | f |
| 1110 | E | 1100 | c |
| 1111 | F | 1101 | d |