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Appendix E: VPN Example
By completing the Quick Start process, a user should have been able to log in and set up the IPn3G to
work with their cellular carrier. By completing this, the modem is ready to be used to access the internet
and provide mobile connectivity. However, one of the main applications of the IPn3G is to access
connected devices remotely. In addition to Port Forwarding and IP-Passthrough, the IPn3G has several
VPN capabilities, creating a tunnel between two sites, allowing remote devices to be accessed directly.
VPN allows multiple devices to be connected to the IPn3G without the need to individually map ports to
each device. Complete access to remote devices is available when using a VPN tunnel. A VPN tunnel can
be created by using two IPn3G devices (Example 1), each with a public IP address. At least one of the
modems require a static IP address. VPN tunnels can also be created using the IPn3G to existing VPN
capable devices, such as Cisco (Example 2) or Firebox.
Example 1: IPn3G to IPn3G (Site-to-Site)
Step 1
Log into each of the IPn3Gs (Refer to Quick Start), and ensure that the Firewall is enabled. This can be found under
Firewall > General. Also ensure that either WAN Request is set to Allow, which allows traffic to come in from the WAN,
or that sufficient Rules or IP lists have been setup to allow specific traffic to pass through the IPn3G. Once that is
complete, remember to “Apply” the changes.
Step 2
Configure the LAN IP and subnet for each IPn3G. The subnets must be different and cannot overlap.
Site A Site B
WAN IP Carrier
Assigned: A.B.C.D
WAN IP Carrier
Assigned: E.F.G.H
Site A
Site B
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