Hello, we have a very basic configuration:

Internet >> Mikrotik FW >> Ubiquiti AP >> Mikrotik as wireless client >> PC NIC (DHCP) + Printer NIC (DHCP)

We had a PC (DHCP) connected wirelessly to the Ubiquuiti AP with no issues.
We now need to connect a cabled printer at the same location as the wirelessly connected PC.
The printer AND the PC both successfully obtain an IP address via DHCP on the cabled connection to the Mikrotik as wireless client but NEITHER can ping the Mikrotik FW or 8.8.8.8.
The Mikrotik as wireless client CAN ping the Mikrotik FW and 8.8.8.8.

I feel this is a MAC address multiplexing issue.
I've searched and hacked but no success.
All equipment is at latest firmware versions.

Ideas?

Many thanks to all.

What you're after is L2-transparent bridge over wifi and can't be done in standard way, it only works reliably when both wireless devices are from same vendor. More expkanation in this article: https://wiki.mikrotik.com/wiki/Manual:W ... tion_Modes

Pfffff .... this can give you quite some headache pain.

Some suggestions :

1; use a Mikrotik AP as link distributor to the Mikrotik wireless client device (call this the MT client).
Then the link can be "AP bridge" on the MT AP, and "station bridge" on the MT client. You get one transparant bridged L2 network to use.

2: as MKX suggested use the MT client as "station pseudo bridge". The pseudo-bridge will do MAC translation. IP addresses behind the pseudo-bridge can reach the FW and 8.8.8.8
Initial access to the devices behind the pseudo-bridge may not be possible. (switch MAC table, or bridge hosts-table must first be populated).
DHCP servers can be disturbed by the missing MAC entry, and might not reach the client device with the IP address offer.
(DHCP lease is offered, and then disappears instead of reaching "bonded" state)
Experience on DHCP varies.

3. Use one MT client per device. (e.g. a hAP Lite or other low cost device).

4. Make a tunnel between the Mikrotik FW and the MT client. The "MT client" is in mode "station". Tunnel used for this (in PtP examples) is either EoIP or for better performance MPLS/VPLS. I assume other L2 tunnels could be used as well. You again have one L2 bridged network.

5 Not sure if WDS between Ubiquiti and "MT client" would work. Security is one potential problem. But WDS even without security is vendor specific.