Cisco SRP521W-K9-G1 Administration Guide - Page 188

Configuring VPN GRE Tunnel 7 GRE Tunnel Use the GRE Tunnel page to configure Generic Routing Encapsulation (GRE). GRE is a tunneling protocol developed by Cisco that can encapsulate a wide variety of network layer protocol packet types inside IP tunnels, creating a virtual point-topoint link to the SRP at remote points over an IP internetwork. STEP 1 Click VPN > GRE Tunnel in the navigation pane. The GRE Tunnel window opens. From this page you can view the existing GRE tunnels, edit a GRE tunnel and add a new GRE tunnel. You can also view the details for each tunnel from the GRE Details list. STEP 2 To add a GRE tunnel, click Add Entry. The window for the new GRE tunnel appears. STEP 3 Choose an identification name for the tunnel and enter a tunnel name. STEP 4 To enable the tunnel, click the Enable box. STEP 5 Specify the parameters for Checksum, Sequence, and Key from the drop-down lists. If you choose a key value, enter its value in the Key Value field. You can enter a value from 0-4294967295. STEP 6 Choose the WAN interface through which the tunnel should be connected. For example: WAN1 or WAN2. The System Default Route is the default setting. STEP 7 Enter the destination IP address of the remote device that will terminate the new tunnel. STEP 8 Enter the IP address and subnet mask of the remote host. Click the Add button to add additional IP addresses or click Delete to remove one. STEP 9 Click Submit to save your settings. GRE Tunnel Settings Field Description Tunnel Number Choose an identification number for this tunnel. You can create up to 10 tunnels. Tunnel Name Enter a name to describe this tunnel. Cisco SRP500 Series Services Ready Platforms Administration Guide (SRP520 Models) 188