The Everything Feed - All Packet Pushers Pods IPB193: IPv6 Basics – Troubleshooting
Feb 5, 2026
A lively walkthrough of IPv6 troubleshooting fundamentals and pitfalls. They cover why labs matter and whether to start diagnostics from the host or the network. Important warnings about not blocking ICMPv6, neighbor discovery, multicast behavior, and link-local testing are highlighted. Practical tips include VM/DUID pitfalls, router advertisement placement, and using familiar tools with IPv6.
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Neighbor Discovery Is Fundamental
- Neighbor Discovery and multicast are prerequisites before unicast IPv6 works.
- Hosts need ND and RA to self-assign link-local and global addresses correctly.
Start With Layer 1–2 Checks
- Verify Layer 1 and Layer 2 connectivity before blaming IPv6 specifics.
- Map ARP troubleshooting habits to IPv6 by checking ND tables and link-layer reachability.
ND Replaces ARP And Shifts Vocabulary
- IPv6 replaces ARP with a richer ND suite that includes router advertisements.
- Vocabulary and config grouping (ND umbrella) can confuse where RA options live in vendor syntax.