in the main office dfl 260e
in the back office mikrotik hap ac
raised GRE tunnel.
Is PACS ERA 2000 v2, which according to information from clause 4 https://www.entpro.ru/vopros-otvet
this page works through UDP packets.
The problem is that data Exchange "Server Controller" occurs at the data link layer. Data are encapsulated in UDP packets. All controllers have a pseudo IP address: 192.A.B.C where A,B,C - the last 3 octets of the MAC address of the controller.
For example, the controller IP address with the MAC address 00:0B:3C:1F:00:DF will be equal to 126.96.36.199
I do not understand how to get to see the controller on a different subnet.