I have a vendor who is dropping a VPN device in our facility for a site to site VPN that is needed to interface with a software we have on site with a software they host for us. I attached a network diagram so you can see what my network looks like. I do have a public IP Address to give them for the outside interface of their VPN device, but I"m not sure where to plug the outside interface of the VPN Device in at. The VPN device is located in the lower left corner of the diagram and must be in the location shown on the diagram as it's behind a locked door and this is a requirement. Will it work, if I just plug the outside and inside interface of the VPN device into the switch as shown. I concerned I'll have issues since it sits behind my router and ASA.