Hi all,
I have a situation that is, I think, a bit unusual. At least for my level of networking expertise :D
I manage a small company network spanning 3 offices that are close to each other, but not directly attached so there is no fixed cabling between them. Each one operates more or less standalone, with its own opnSense device as firewall. We have 2 wireless links set up, connecting the offices (see image for a rough topology sketch).
Currently, each site has its own WiFi networks (one for employees, one for guests). We want to improve this situation, so that we have the same WiFi networks in all offices.
Of course we could just use the same SSIDs and Passwords across the sites, but this has other downsides and I want to take the chance to use more professional equipment that can be managed centrally.
So I was thinking about getting three Access Points (e.g. the Ubiquiti UF6+) and using the UniFi controller software to set them up to "really" broadcast the same network. This would require the APs to be in the same VLAN which I could set up easily (the wireless links are on layer 2 to act as "virtual cables", carrying tagged VLANs).
However, since each of the sites has its own DSL uplink and opnSense firewall, this poses the question which one of those would handle the traffic. Naturally, I want to avoid having only one site handling all the WiFi traffic while the rest needs to go through the wireless links. (However, this would probably still work since performance is not the issue here, neither latency nor bandwidth are particularly critical).
So, my question is: Is this a reasonable plan, and how would I configure the opnSense firewalls to handle this? Or is this idea of a unified WiFi using 3 different uplinks stupid/unfeasible?
Thanks in advance for any input.