Configuring your Sierra Wireless AirLink modem for IP Manager and DNS
If you have a fleet of Sierra Wireless AirLink modems or even if you only have one, it can be difficult to keep track of the current IP addresses, especially if the addresses aren’t static but change every time the modems connect to your cellular provider. If you need to connect to a modem, or the device behind it, it is so much easier when you have a domain name (car54.mydomain.com, where are you?).
Reasons to contact the modem and/or the connected device:
•Requesting a location update from a delivery truck.
•Contacting a surveillance camera to download logs or survey a specific area.
•An oil derek that needs to be triggered to begin pumping.
•Sending text to be displayed by a road sign.
•Updating the songs to be played on a juke box.
•Updating advertisements to be displayed in a cab.
•Remote access to a computer, a PLC, an RTU, or other system.
•Monitoring and troubleshooting the status of the modem itself without needing to bring it in or go out to it.
A dynamic IP address is suitable for many Internet activities such as web browsing, looking up data on another computer system, data only being sent out, or data only being received after an initial request (also called Mobile Originated).
However, if you need to contact your modem directly, a device connected to the modem, or a host system using your modem (also called Mobile Terminated), a dynamic IP won’t give you a reliable address to contact (since it may have changed since the last time it was assigned).
Domain names are often only connected to static IP addresses because of the way most domain name (DNS) servers are set‐ up. Dynamic DNS servers require notification of IP Address changes so they can update their DNS records and link a dynamic IP address to the correct name.
•Dynamic IP addresses are granted only when your modem is connected and can change each time the modem recon‐ nects to the network.
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