Vpn Configuration; Gre - Planet VCG-1500WG-LTE User Manual

192.168.3.0 connects with gateway LAN1-4, so interface needs to select br0. This function is to send data of gateway
destination IP address 192.168.3.0/24 from outside to br0 interface to realize sending data packet to 192.168.3.0.
This routing function is: data packet sent to wireless gateway, if destination IP address is 172.16.0.0/24; it transmits this
data packet to PPP1 interface, meanwhile, this data packet gateway IP is 192.168.2.6. So through this routing, wireless
gateway sends data packet to PPP1 directly when receiving data packet of destination IP 172.16.0.0/24, then arrive server
192.168.2.6, then transmits data packet to 172.16.0.0/24 through server's router to finish all routing work of data packets.

5.4 VPN Configuration

5.4.1 GRE

GRE is VPN（Virtual Private Network ）third tunnel protocol, that is to adopt Tunnel technology among protocols.
Figure 5-3-3 Add Route
Figure 5-3-4 Modify Route
Figure 5-3-5 Routing Table
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User's Manual of VCG-1500WG-LTE