Hello,
Our Fortigate router is on the 192.168.1.0 network (Not our doing), and we are trying to connect to a vendor's Cisco ASA but they have another VPN with the same subnet as ours. They said there isn't anything they can do on their end. Is their something I can do on my end to get this connected? A Virtual IP to mask our actual LAN subnet to the VPN?
it would be better to change your network if you can.
How many devices do you have on your network?
Regards,