© Microhard Systems Inc. 196
Appendix G: Troubleshooting
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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 WAN 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 WAN 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.
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Question: Why does my modem reset every 10 minutes (or other time)?
Answer: There are a number of processes in the IPn3G that ensure that the unit is communicating at all
times, and if a problem is detected will reboot the modem to attempt to resolve any issues:
1. Wireless Traffic Timeout - Detects if there is any Wireless Traffic between the IPn3G and the
Cellular Carrier. Will reboot modem when timer expires unless there is traffic. System > Settings.
2. ICMP Keep Alive - Attempts to contact a configured host on a defined basis. Will reboot
modem if host is unreachable. Enabled by default to attempt to ping www.google.com. May need
to disable of private networks. Carrier > Config.
3. Reboot Scheduler - The IPn3G can be set to reboot on a regular basis. Tools > Reboot.
4. Local Device Monitor - The IPn3G will monitor a local device, if that device is not present the
IPn3G may reboot. Network > Device Monitor.
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Question: How do I set up VPN?
Answer: Refer to the VPN Appendix for an example.
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