The UniFi guest network is very well catered for within the UniFi Network Application. 1.
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Unifi multiple subnets
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Unifi multiple subnets
If you expect the UniFi range to be plug-and-play, you are expecting too much – in most cases it will work, but you do require at least a basic understanding of networking, subnets / IP-ranges and should feel comfortable via SSH / Telnet and CLI You have to disable source-validation, thanks to Roelf for the comment with the correct command Prerequisites. 00:24 - Multiple WAN IPs on UDM.