D-Link DSR-1000AC User Manual - Page 147

Section 7 - VPN GRE VPN > VPN Settings > GRE GRE tunnels allow for broadcast traffic on the LAN of the router to be passed over the internet and received by remote LAN hosts. This is primarily useful in the D-Link Discovery Protocol (DDP) application where broadcast traffic from one LAN host is to be received by all LAN hosts in the local subnets of the GRE endpoints. Note the following limits for the number of supported GRE tunnels per product: • DSR-150/150N: 5 • DSR-250/250N: 10 • DSR-500/500N/500AC: 15 • DSR-1000/1000N/1000AC: 20 There are two simple steps involved in establishing a GRE tunnel on the router: 1. Create a GRE tunnel from the GUI 2. Setup a static route for the remote local networks using the GRE tunnel When creating the GRE tunnel, the IP Address should be a unique address that identifies that GRE tunnel endpoint. It will be referenced in the other router's static route as the Gateway IP address. The Remote End Address in the GRE tunnel configuration page is the WAN IP address of the other endpoint router. Once the tunnel is established, a static route on the router can be made using the interface set to the configured GRE tunnel name. The destination IP address of the static route is the remote LAN subnet, and the route's gateway IP address will be the GRE tunnel IP of the terminating router (the same router that manages the remote LAN subnet). Once these two steps are completed, all DDP broadcast traffic can flow between remote LAN subnets via the GRE Tunnel. To create a GRE tunnel: 1. Click VPN > GRE > GRE Tunnels. 2. Click Add New GRE Tunnel. D-Link DSR-Series User Manual 134