Hello,
* Does the supplied RB750GL support VLAN tagging on both the WAN and LAN ports?
Probably yes.
* I know that the gateway identifies and authorises users/devices by their Layer-2 MAC address, but how does it control traffic flow? Is it acting as a selective L2 bridge or L3 router?
* If the gateway is a L2 bridge, does it correctly handle Spanning Tree, ARP, etc on the local network?
The gateway router will create a new subnet and all the hotspot traffic is re-routed so it goes through NAT, this is how it can handle the traffic limit.
Best Regards,
Steve Hars,
Hotspotsystem.com