I just watched "Sophos Firewall: Configure SSL VPN remote access" video. The video is confusing!
The intro states you are going to set up a vpn from a 10 network to a 192 network. Sounds good. Except the background shows you are connected to a firewall at 10.118.200.252. That's weird! My initial expectation was that the firewall is on the same subnet as the resources we want available.
After watching this a few times, I have figured out that the firewall is probably on VLAN 1 and is on a 10./24 network. There is a second VLAN that is on a network of 192.168.3.0/24. Actually, a bit clever security wise; never seen it done this way.
But it is overly complicated for a video on setting up a VPN. K.I.S.S. Cut out the VLANs and just set it up as a simple firewall.