Configuring VPN
GRE Tunnel
80 SRP 521 VoIP Gateway Administration Guide
6
GRE Tunnel
Generic Routing Encapsulation (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 Cisco routers at remote points
over an IP internetwork.
Clicking the Add Rule button opens the GRE Configuration page.
STEP 1 Click VPN on the tab and then click GRE Tunnel in the navigation pane. The GRE
page appears.
STEP 2 Click Add Rule. The GRE page opens.
STEP 3 Select the tunnel number that you are going to configure.
STEP 4 Enter a name for the tunnel.
STEP 5 Set the Checksum, Sequence, and Key parameters.
STEP 6 Enter destination IP address of the remote network or host to which you want to
build a tunnel.
Encryption
Algorithm Key
A HEX value, the length depends on the key type of
Encryption Algorithm above. For example, 3DES length
is 32.
Integrity Algorithm
Key
A HEX value, the length depends on the key type of
Integrity Algorithm above. For example, MD5 is 32, and
SHA1 is 40.
Local Traffic Selection
Local IP/IP Address/
Subnet Mask
Selecting a local group which is allowed to pass through
this tunnel.
Remote Traffic Selection
Remote IP/IP
Address/Subnet
Mask
Selecting a remote group which is allowed to pass
through this tunnel. If the remote end point option is
selected with Any, these inputs will be grayed and
ignored.
Field Description
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