But I fail to see how it could help me recover a broken down device where it was not enabled.
I thought you mean RoMON could be used to transport MAC level access from outside to the PC on the inside and then relayed to the LHG, but
that does not appear to be the case.
At the moment, MAC telnet and winbox are enabled on the outside interface and it works.
Now we'll get to see if they still work when it next breaks down.
Maybe I'll enable RoMON, but frankly I have not been in the situation that RoMON tries to solve, probably because the network is solidly designed and does not use NAT.
Regarding the LHG, it may be defective.
I am very interested in the kind of defect that would cause this behaviour...
(IP address resetting to 0.0.0.0 and bridge function from ethernet to wlan still working and transporting traffic)
If anything, I more suspect "Quickset" in the hands of a novice operator.