IPv6 Addressing with EUI-64

Bundle lab · $29.99

Configure IPv6 global unicast on a router-to-router link using EUI-64-derived interface IDs. Enable IPv6 unicast routing, set explicit link-local addresses, and verify that each router auto-forms its 64-bit interface ID from the MAC (FFFE insertion with U/L bit flip). Validate directly-connected reachability only. No routing protocols or static routes.

Learning objectives

• Explain how EUI-64 forms an IPv6 interface ID from a 48-bit MAC (split, insert FFFE, flip U/L bit).
• Enable IPv6 unicast routing and configure an interface with IPv6 using the eui-64 keyword.
• Set and verify explicit IPv6 link-local addresses separate from global unicast.
• Confirm the derived EUI-64 address on each end and validate directly-connected pings.
• Avoid unintended routing by excluding any routing protocols or static/default routes.

Troubleshooting focus

• Forgetting 'ipv6 unicast-routing' prevents global IPv6 from forming/forwarding.
• Wrong prefix on one end (not /64 or not the same /64) prevents neighbor reachability.
• Interface shutdown or wrong physical port assignment breaks the link.
• Duplicate/mistyped link-local address can cause neighbor confusion or ND anomalies.
• Relying on SLAAC or DHCPv6 on a point-to-point when the peer expects manual config.