I have a setup with a ISP modem/router, which broadcasts DHCP addresses within range 192.168.192.x
I added a MikroTik RB2011 to extend the physical and wireless network to a different floor.
At the RB2011, I have physically connected a PC (DHCP, 192.168.88.x) and a printer and NAS (fixed IP in range 192.168.192.x).
All internet connections in RB2011 broadcasted network are working fine.
I need to be able to make a connection from the PC mentioned to the printer and NAS, but unfortunately that is not working anymore.
Only addresses I can ping in the other segment are 192.168.192.1 (the DNS) and 192.168.192.39 (RB2011 address).
You need to add some configuration in 192.168.192.0 network. If you can do, then add static route on ISP modem/router … network 192.168.88.0/24 gateway 192.168.192.39. If you can’t do that, then there are a few possibilities:
manually add route (described above) to all devices in 192.168.192.x that you want to connect from 192.168.88.0/24
do src-nat on RB (things will work for connections from 192.168.88.0/24 towards devices on 192.168.192.0/24 but not vice versa
extend 192.168.192.0/24 by using your RB as a switch/wifi access point - without using any advanced functionality provided by RB, such as routing, firewalling, DHCP, …
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Personally I’d go with third possibility.