3 Sites OpenVPN

[NFKhalaychidi]

Please help me in solving the problem.
There is a network shown in the attached diagram.
There are three OPNsense routers in it.
There is an OpenVPN tunnel (172.16.1.0/24) between routers site1-gw and site2-gw, and the same tunnel between routers site1-gw and site3-gw (172.16.2.0/24).
What should I configure so that the computer in Site 2 can access the computer in Site 3 and vice versa?
At the same time we can't set up another VPN tunnel between Site2 and Site3 for administrative reasons.

[viragomann]

You just need to set the "Remote Networks" properly to route the traffic for the respectively other site over the VPN.

Presuming the routes between site 1 - 2 and 1 - 3 are working already, there is nothing else to do at site 1.

At site 2 the "Remote Network" settings should be

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192.168.10.0/24,192.168.30.0/24
and at site 3

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192.168.10.0/24,192.168.20.0/24

[NFKhalaychidi]

You just need to set the "Remote Networks" properly to route the traffic for the respectively other site over the VPN.

It's always so simple, but I often can't find the answer because I always think that it must be hard.
Thanks a lot!