Re: [PATCH v6] r8152: Add support for setting pass through MAC address on RTL8153-AD

quoted

It is same, how to handle two network cards which tell us, that they
have same MAC addresses.

The kernel handles this just fine.  In doing this patch I checked to see
what it does in that scenario.  Two devices are made.  systemd doesn't
rename the second device via the MAC name (eg enxAABBCCDDEEFF).

What does you dhcp server do? Does it gives out the same IP address?
You then have two interfaces on the same network, with the same MAC
address and IP address. Then what happens?

     Andrew