In that case it may be better to do a local test first, get the hang of it, and then if it doesn’t work in target location, you’ll know that it’s not you. If the network cares a lot about security, maybe it’s something they are doing, perhaps they don’t like more than one MAC address connected to one port, or something.
Finally sorted out this task, but I have applied different approach. I do not use bridge any more and I have configured 2 subnets on the router (mAP 2ND.) The first subnet on ethernet 1 is 192.168.4.0/24. Then just classic src and dst NAT worked. Now I have access to the Ethernet device.
Thank you, Sob, for your time and guidance, much appreciated, I have learned other stuff from you working on that task! Hope to keep the same good communication for new challenges in the future.
Yes, that too can be used. I took 192.168.4.153 for the device as requirement, I didn’t think much about it, that maybe it isn’t. 