Answer
Why does my new router show a WAN and LAN subnet conflict with Starlink?
A routing device needs to distinguish its upstream network from the network it serves locally. If both sides use the same address range, it may be unable to decide which direction traffic should take.
Record the WAN address, LAN address and subnet mask shown by your router. If the ranges overlap, use the router manufacturer's procedure to choose a different LAN range. Do this while you have local access and a copy of the existing settings.
The management address may change when you save. Reconnect the test device so it receives an address in the new range, then use the new management address. Update any deliberate static addresses or reservations afterward.
Test normal internet access and local devices before reconnecting everything. Do not change the Starlink service address or account to solve a local addressing conflict; those are unrelated settings.
Related guide
How to Add a Firewall Appliance to Starlink Without Breaking Your Network
Reference
Official Starlink support for your equipment and account. Equipment features and procedures vary; use the instructions for your exact model.
Reviewed 25 October 2026. Practical checklists are Starlink Tips editorial guidance, not claims of hands-on testing.
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