Frequently Asked Question
UniFi SD-WAN Mesh will not connect two sites using the same subnet. What should I plan?
QUICK ANSWER
Overlapping LAN address ranges conflict in a mesh that does not translate them. Check the SD-WAN topology first; newer NAT-capable fabric options have different capabilities and are not interchangeable with mesh.
Applies to: UniFi Site Magic/SD-WAN Mesh. Check the exact gateway, Network version and selected fabric/topology.
Work through these checks
- Record both networks. List the participating LAN/VLAN ranges and identify an overlap. Compare the actual routes, not only friendly network names.
- Confirm the fabric type. Read the capabilities of the selected mesh or hub/spoke mode. Do not apply a mesh limitation to every newer UniFi SD-WAN configuration.
- Prepare a renumbering plan if required. If the chosen topology needs unique subnets, inventory DHCP reservations, statically addressed equipment, DNS and firewall dependencies before selecting an unused range.
- Validate in a maintenance window. Retain local management access and a rollback. After an authorised change, check device addresses and the required site-to-site service rather than only the tunnel status.
Confirm the result
The intended networks have usable, unambiguous routes and an authorised test client can reach the required service.
Before going further: Do not renumber a production site during an active session without accounting for printers, NAS systems, cameras and other static addresses.
If you need help
Include these details in your ticket: Gateway/Network versions, fabric type and a sanitised subnet diagram. Omit public addresses and credentials when unnecessary.
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Updated 261110