Datasheet

Configuring VPN
GRE Tunnel
Cisco SRP500 Series Services Ready Platforms Administration Guide (SRP520 Models) 188
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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-to-
point 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.