DPX8000 Series Deep Service Switching Gateway User
Configuration Guide Firewall Service Board Module v1.0
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3.3 GRE VPN
3.3.1
Introduction to the GRE
Generic Routing Encapsulation (GRE) is a protocol designed for encapsulating and carrying the packets of one
network layer protocol (for example, IP or IPX) over another network layer protocol (for example, IP). GRE is a
tunneling technology and serves as a Layer 3 tunneling protocol. A GRE tunnel is a virtual point-to-point
connection for transferring encapsulated packets.
3.3.2
Configuring GRE configuration
To enter the GRE configuration page, you choose
Firewall module > VPN > GRE
, as shown in Figure3-8.
Figure3-8
GRE
Table3-6 describes the details of GRE.
Table3-6
GRE
Item
Description
Tunnel interface NO
Configure the GRE tunnel interface NO (the number is from 1 to 64).
Tunnel interface IP address
Configure the GRE tunnel interface IP address.
Tunnel source interface/IP address
Configure the GRE tunnel source interface IP and you can select tunnel interface or IP
address.
Tunnel destination IP address
Configure the GRE tunnel designations IP address.
Advanced configuration
The advanced configuration provides uses with path MTU discovery and checksum
checkout.
Operation
Allows you to copy or delete the GRE rule.
To create a GRE rule:
Enter a GRE name which is correspond to the requirement
Enter the tunnel interface IP address, such as 6.6.6.1/24
Configure the tunnel source interface IP address, such as 10.66.0.12 or eth0_7
Configure the tunnel destination IP address, such as 6.6.6.2/24
Configure the advanced configuration, and select the discovery, checksum checkout option