How to set up a point to point connection in 4 sites

Hi all.
I'm investigating the option of set up a point to point connection around 4 sites.
I will call Site01, Site02, Site03 and Site04.
Site01 will be the main one with a Main Domain Controller.
Site02, Site03 and Site04 will be the Secondary Domain Controllers.
I need to install an VPN Router on each Site to create a full VPN Network, I mean, All the computers should see the other computers.
I need some support about it.
I suppose that I have to config like this:
Site01 with VPNRouter01 will have the IP range 192.168.1.X.
Site02 with VPNRouter02 will have the IP range 192.168.2.X.
Site03 with VPNRouter03 will have the IP range 192.168.3.X.
Site04 with VPNRouter04 will have the IP range 192.168.4.X.
If I config on each VPNRouter 3 point to point VPN connection is the only config that I have to do?
I mean, is not neccesary to config anything else?
I suppose that for example, the client with IP 192.168.1.10 should have the following IP address as well:
192.168.2.10
192.168.3.10
192.168.4.10
Is this neccesary to see all the clients on the remote networks?
Thanks and best regards.

HI,
Try the below
1) Configure site to site vpn from all the three site to the HUB site.
2) Configure ospf or any dynamic routing protocol on the vpn, thus you will have routes of site1, site2 and site3 in site4 and visaversa.
Once you have the connectivity established you can access any computers from any site.

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Applet Viewer connects to the HTML documents and resources specified in the call to appletviewer, and displays the applet in its own window. To run the example, Ray copies the signed JAR file and HTML file to /home/aURL/public_html and invokes Applet viewer from his home directory as follows:
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