Use safely: Follow these steps only for a router or network you own or are authorised to manage. Never send Router Portal a router password, Wi-Fi key, MAC address, serial number or private screenshot.
Evidence and scopeSOURCE-BACKED · CHECK DATE
Sources2 official references
ScopeModel/OS/network dependent
CredentialsNever universal
ReviewRecheck after UI changes
Quick answer: An address conflict can arise from a second DHCP server, a manually assigned address inside the pool, stale reservations or a device returning from sleep.
What this page covers
Record the duplicate symptom and locate the address authority before changing pool settings.
Step-by-step workflow
- Record the conflicting address and affected interfaces without publishing it.
- Check whether a second router, extender or hotspot is connected.
- Compare DHCP reservations with manually configured clients.
- Move one conflicting device to a documented automatic profile and retest.
Decision table
| Check | What it tells you | Safe next action |
|---|---|---|
| Two devices report same IP | Duplicate assignment or manual override | Inspect reservation and static settings |
| New router added | Two DHCP authorities may exist | Use one intended LAN authority |
| Conflict after sleep | Lease or resume state may be stale | Renew and verify the lease |
Limits and verification
MAC addresses and private IPs are sensitive operational data. Keep evidence private and avoid assuming malicious activity from one conflict.
Official sources
- IETF RFC 2131 — Dynamic Host Configuration Protocol (DHCP message and lease concepts)
- CISA — Securing Home Network Devices (home-network safety guidance)
Related Router Portal guides
Find the current gateway · Router security guide
Editorial note: This pilot page is written for one distinct question. Firmware, operating-system menus, ISP policies and regional radio rules can change, so confirm the source and exact device before applying a setting.