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H792x 3G/4G Router User Manual
After a VPDN rule is added, router will build VPN communication with service address
automatically. To see the tunnel status, click “View” in “Tunnel” tab.
Figure 4-50
L2TP tunnel status
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4.6.3
Tunnel configuration
Tunnel technology transfers data between the networks through the Internet
infrastructure. In the whole process of transmission, when the encapsulated data package
delivered on a public Internet, the logic path which the packet passes through is called
tunnel.GRE and IPIP Tunnel configuration supports two modes.
GRE (Generic Routing Encapsulation, Generic Routing protocol encapsulation) specifies
how to use a network protocol to another network protocol encapsulation method. The
main purpose of the GRE protocol, there are two: internal protocol encapsulation and
private address encapsulation.
IPIP tunnel is a simple agreement between two routers for IP packet encapsulation, IPIP
tunnel interface will be like a physical interface in the interface list, many routers including
Cisco, basically support the agreement. This agreement enables multiple network
distribution possible.
Step 1
Click “VPN > Tunnel” to open “Tunnel” tab.
Step 2
Click “Add” to add a new tunnel.
