I'm trying to set up site to site VPN from office to the owner's house. Don't have any experience with VPN at all.
Right now, I'm testing it at my place and so far it works one way. I can access everything in the office from home. I can ping any device on office network, remote to the servers, etc. However, it failed when I tried to access the computer at home from the office even when I connected directly to the router.
On office network, we have the main internet line goes to a switch and then split 4 ways to 4 different gateways. This is due to the internet connection being shared with other tenant in the same building.
1. Untangle box that we use as main gateway
2. Sonicwall used by one tenant.
3. RV-042 routed to a different VLAN used by yet another tenant.
4. RV-120W that I'm using to set this VPN connection.
All 4 of these has their own public IP.
I probably left out some details on this as well. Attached is a rough schema on how the main line connected in the office.