IPv6 Icky EUI-64 Drill 1 – Answers
Short and icky sweet: this post lists answers for the icky EUI-64 drill 1 for #ICND2 and #CCNA. The problems require you to find the IPv6 address a host or router would use, given a prefix, MAC address, and assuming they use stateless auto-configuration. This post lists the answers.
Related links:
The Answers
Table 1 lists the original problems. Table 2 then lists the unicast IPv6 addresses as calculated with EUI-64, before abbreviation, with table 3 listing the same addresses in abbreviated form as requested. Table 4 then lists the solicited node multicast address just for fun. Also, for a quick review, note that the rules for creating the second half of the unicast address using SLAAC is as follows: split the MAC, insert FFFE, and invert the 7th bit. Figure 1 summarizes the process.
Figure 1: EUI-64 Rules Used by SLAAC
Table 1: Original Problems
Table 2: Unabbreviated Unicast Addresses Found with SLAAC
Table 3: Abbreviated Unicast Addresses Found with SLAAC
| Abbreviated Unicast IPv6 Addresses | |
| 1 | 2001:DB8:9283:102:20C:12FF:FE34:5678 |
| 2 | 3000:D0D0:D0D:BEEF:103:3FF:FE03:3030 |
| 3 | 2001:DB8::E00:BEFF:FEEF:CAFE |
| 4 | 3100:202:1010:AA:213:BFF:FE0B:B0B0 |
| 5 |
2001:DB8::2200:98FF:FE76:5432 |
Table 4: Solicited Node Multicast Addresses
the problem was to write shortest abreviated ipv6 address. answer shows unabreviated version of addresses.
2001:db8:9283:102:20c:12ff:fe34:5678
3000:d0d0:d0d:beef:103:3ff:fe03:3030
2001:db8::f00:beff:feef:cafe
3100:202:1010:aa:213:bff:fe0b:b0b0
2001:db8::2200:98fe:ef76:5432
Keith,
Thanks. Added a table. Appreciate the heads up.
We can also take it to the next step and “shrink” the address to what the router will display:
1 — 2001:DB8:9283:102:20C:12FF:FE34:5678
2 — 3000:D0D0:D0D:BEEF:103:3FF:FE03:3030
3 — 2001:DB8::E00:BEFF:FEEF:CAFE
4 — 3100:202:1010:AA:213:BFF:FE0B:B0B0
5 — 2001:DB8::2200:98FF:FE76:5432
table 3 row 5 second quartet is 0DB8, abbreviated form is DB8.
Also, column heading says “Unabbreviated Unicast IPv6 Addresses” should say “Abbreviated Unicast IPv6 Addresses”
Hey John,
Thanks! Fixed both.
Wendell