Hello,
Source of the issue is flat IP network addressing over the whole network. The only way to resolve the issue not changing the notwork configuration physically is divide the network to separate subnetworks (probably within the same addresing space).
I can improve and fine tune your network.
I have over 15 years of progressive IT experience in providing and support of network solutions for corporate and banking sector.
Extensive experience with TCP/IP networking, advanced routing and switching, VPN tunneling, VoIP technologies, wireless and satellite telecommunications with experience in the fields of network security and Intrusion prevention solutions and systems.
Excellent knowlege in Mikrotik management and RouterOS configuration.