I recently started at a company with no IT infrastructure and have been task with getting the network set up. I do not have a lot of networking experience and have been doing research in trying to connect our sites via VPN tunnel. We have 3 sites 2 of which already have tunnel between them and that was set up by a 3rd party IT Support company. Currently they are using Watchguard Fireboxes as the router in the 2 locations that have the tunnel between them. Will I need to purchase another firebox or can a VPN tunnel be configured from any router. Will the site that I am trying to connect to need to purchase a static IP Address like the other 2 sites have or what is the best route of trying to get that set up?
Another concern that I have is that the site I am trying to set up is using the 192.168.1.x subnet but the first site where I work out of is already on that subnet. Can I just change the subnet of the router or what needs to be done to change that site to 192.168.2.x? Networking is a completely new field for me so I appreciate any and all help.