I have two buildings connected by a wireless bridge using TP-Link C7's. The distance between the buildings, as well as obstructions in-between (pavement etc.) meant that stringing a wire was not possible. The TP-Link are running stock TP-Link software, and are connected using WDS.
The result is that I have a connection between the buildings - everything is on a single network (broadcast domain). The connection is Bldg1CoreSwitch-ethernet-[C71LanPort-WiFi]-[WiFi-C72LanPort]-ethernet-Bldg2CoreSwitch. There are no VLANs involved, DHCP is turned off, NAT and firewall don't matter because the WAN port is not used.
For security and QOS reasons, I need to implement VLANs. No problems implementing them in each building, but now I need the WiFi bridge to act like a VLAN trunk. Essentially, I want the two APs (and the WiFi link) to act like a length of ethernet cable - all the bits that come in one end come squirting out the other. The Core switch at the other end will accept all the bits and do the VLAN processing.
A second option - I have few VLANs, so if the bits come in through the four LAN ports (one VLAN per port), the WiFi is a trunk which is VLAN-tagged, and the C7 at the other end access the trunk over WiFi and splits out the VLANs over the four LAN ports at the other end (basically, each LAN port is an untagged Access port), then that also works. Unfortunately, this uses up a bunch of switch ports, so I would prefer the cable between the C7 and the Core Switch be a tagged VLAN trunk.
MikroTik seems to have some hardware that does this - I was hoping I could flash a *WRT onto the routers and effect the same result.
The solution needs to be wireless - the highly effective, low-tech option of stretching some cable, isn't possible.