How to setup for site to site with VPN and both sites have same subnet

PeterUK

Site A and B can connect to each other using a fake IP subnet to map to from real LAN subnet that are the same on both sites.

From Site A 192.168.138.4 to 192.168.70.5 maps to 192.168.138.5 on site B

From Site B 192.168.138.5 to 192.168.69.8 maps to 192.168.138.8 on site A

SSL VPN

From site A 192.168.141.4 to 10.255.255.3 maps to site B 192.168.138.3

Zyxel_Jeff

Dear @PeterUK

Thank you for the valuable information you shared with us☺.