Hi,
The newest of the two is on R_00.06.06.1, they use Open VPN protocol & subnet mask is 255.255.255.0. We have other routers working on this firmware so i don't suspect it to be a firmware issue. The older one also worked at a previous site as well & all that was changed between the two was the IP of the router & the start/end address for the DCHP server.
I have done some testing since on a router the latest firmware (R_00.06.07.5) while not connected to any devices & haven't found any issues connecting over the VPN. Is it possible that something within the internal IT network that we are VPN in is blocking IP's or should the VPN be able to assign us an IP in the designated range regardless?
Regards,
Stephen