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STATUS_IP_ADDRESS_CONFLICT1
Capture duplicate-address evidence before changing DHCP or disabling conflict detection
STATUS_IP_ADDRESS_CONFLICT1 belongs to duplicate IP address diagnosis. For IPv4, RFC 5227 defines Address Conflict Detection with ARP Probes and Announcements. For IPv6, RFC 4862 defines Duplicate Address Detection and requires a tentative address found to be duplicate not to be assigned to the interface. Windows exposes address states such as Tentative and Duplicate through the NetTCPIP cmdlets.
A conflict does not automatically mean the DHCP server issued the same lease twice. Microsoft documents Event 4199 cases where a switch or router IP Device Tracking feature sends an ARP probe while a Windows client is performing conflict detection, causing the client to interpret the probe as duplicate-address evidence. Static addresses, cloned virtual machines, stale network configuration, and layer-2 segmentation mistakes also need to be considered.
Preserve the interface, VLAN or broadcast domain, candidate IP, MAC addresses observed in ARP or Neighbor Discovery traffic, and the DAD state timeline. Disabling DAD removes a safety mechanism and can leave two nodes using the same address without a Windows warning; it should not be the first diagnostic action.
What to inspect
- The affected interface, candidate address, prefix, address origin, and Windows
AddressStateat the failure time. - ARP Probe/Announcement or IPv6 Neighbor Solicitation evidence showing which link-layer addresses claim the IP.
- DHCP lease history, static assignments, VM cloning, and switch/router features that can generate conflict-detection traffic.
References
- RFC 5227: IPv4 Address Conflict Detection
- RFC 4862: IPv6 Stateless Address Autoconfiguration
- Microsoft: Get-NetIPAddress address states
- Microsoft: Event 4199 and IPv4 duplicate-address detection
- Microsoft Open Specifications: NTSTATUS values
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