I have a new warehouse coming online (Site 2) that I need to configure a site-to-site tunnel with. I'm stuck with having to try and make this configuration work with what they have but am a little confused. Site 1 has a bit more detail I didn't add to the drawing above as it doesn't pertain to Site 2.
Site 2 does not currently have a firewall. They purchased a Cisco ASA 5506 X, which is shown in the drawing, so we can create the tunnel. However, I found out that they only have 2 unmanaged switches. So from my understanding, I need to set their client's default gateway to point to the private interface on the ASA, they currently point to private interface on the Internet router, which will now have a public IP address along with the public interfaces of both the router and the ASA. Will this work? Will traffic from their LAN destined for the ASA know where to go? I can't point a route back to the LAN, there's nothing to point to.