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Appendix H: Troubleshooting
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Question: How do I access the devices behind the modem remotely?
Answer: To access devices behind the VIP4G remotely, several methods can be used:
A. IP Passthrough - The VIP4G is transparent and the connected device can be access directly.
Refer to The IP-Passthrough Appendix for a detailed example of how this may be deployed.
B. Port Forwarding/DMZ - Individual external WAN ports are mapped to internal LAN IP’s and
Ports. See the Port-Forwarding Appendix for a detailed example.
C. VPN - A tunnel can be created and full access to remote devices can be obtained. Required
the use of multiple modems or VPN routers. See the VPN Appendix on an example of how to set
up a VPN.
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Question: I have set up firewall rules and/or port forwarding rules but they do not work?
Answer: Ensure that the Firewall is Enabled. Even port forwarding requires that the firewall feature is
enabled. If the WAN/4G request is blocked (recommended), additional rules will need to be
created for any external request.
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Question: I have Internet/4G access but I cannot ping the device remotely?
Answer: Ensure that the 4G/WAN request is enabled in the Firewall settings, or create a Firewall rule to
allow ping messages.
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Question: I’m using IP-Passthrough but the serial ports won’t work?
Answer: When using IP-Passthrough, the WAN IP is assigned to the device connected to the Ethernet
port, all traffic is passed through to that device. As a result serials port will not work. The only
port not being passed through is the remote management port (default port 80), which can be
changed in the security settings.
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Question: I’m using IP-Passthrough but the modem won’t take my Firewall settings?
Answer: When using IP-Passthrough, the 4G IP is assigned to the device connected to the Ethernet port,
all traffic is passed through to that device. As a result the firewall settings have no effect on the
unit, and is automatically disabled.
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Question: I cannot get IP-Passthrough to work?
Answer: When using IP-Passthrough, the 4G IP is assigned to the device connected to the Ethernet port,
all traffic is passed through to that device. In order for IP-Passthrough to work, the connected
local device must have DHCP enabled, or the 4G IP set as a static IP in the end device.
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