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STATUS_ND_QUEUE_OVERFLOW
Neighbor Discovery queued more packets than it could retain
IPv6 Neighbor Discovery resolves a next-hop address and verifies neighbor reachability before queued packets can be transmitted. This status means the queue associated with unresolved or incomplete neighbor state exceeded its implementation limit.
The root cause is usually not the application payload itself. Look for failed Neighbor Solicitation or Advertisement exchange, incorrect VLAN or interface selection, duplicate addressing, filtering of ICMPv6, or a next hop that is not responding. Immediate retries can add more packets to the same unresolved queue.
What to inspect
- Capture neighbor-cache state, interface, destination, and queued traffic rate.
- Verify that required ICMPv6 Neighbor Discovery messages are not blocked.
- Use bounded retry and investigate why address resolution is not completing.
References
- IETF RFC 4861: IPv6 Neighbor Discovery
- Microsoft: netsh
- Microsoft Open Specifications: NTSTATUS values
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