I need to connect 4 separate offices to the same file server remotely. To achieve this the offices will be connected over the internet with BT ADSL using LAN to LAN VPN routers with the following IP configuration
Location 1 Router internal IP Address 192.168.20.254 Subnet Mask 255.255.255.0
Location 2 Router internal IP Address 192.168.21.254 Subnet Mask 255.255.255.255
Location 3 Router internal IP Address 192.168.21.254 Subnet Mask 255.255.0.0
Location 4 Router internal IP Address 18.104.22.168 Subnet Mask 255.0.0.0
I have been told VPN connections wont work? is this correct or is it something to do with the IP's/subnets that are incorrect? why would this not work? what kind of routers would I need?