I'm trying to create a bridge ethernet LAN (span a subnet over another site) like so https://isc.sans.edu/forums/diary/Bridging+Datacenters+for+Disaster+Recovery+Virtually/19091/ so that I have the same subnet running at 2 different sites. Useful for disaster recovery scenarios when you have to migrate VM's to another site but keep the same subnet the VM is running on so that the VM's IP address does not have to change.

Drayteks support GRE VPN tunnels, does anyone know what the config would look like? does CLI need to be used?

fyi a 2925 using firmware 3.8.0.1 is at both ends of the VPN.܀