User manual

IP Manager RLXIC-SV ♦ Intelligent Cellular
User Manual RadioLinx Intelligent Cellular Serial Modem for the Verizon Wireless CDMA Network
ProSoft Technology, Inc. Page 75 of 146
May 29, 2009
8 IP Manager
In This Chapter
 Understanding Domain Names .............................................................76

Dynamic Names....................................................................................77
 Using IP Manager with your RLXIC-SV.................................................77

Understanding DNS ..............................................................................79
If you have a fleet of RLXIC modems or even if you only have one, it can be
difficult to keep track of the current IP addresses, especially if the addresses are
not static but change every time the modems connect to 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.
8.1.1 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 derrick 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 RLXIC-SV directly, a device connected to the
modem, or a host system using your RLXIC-SV (also called Mobile Terminated),
a dynamic IP will not give you a reliable address to contact (because 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 RLXIC-SV is connected,
and can change each time the modem reconnects to the network.
 Static IP addresses are granted the same address every time your RLXIC-SV
is connected, and are not in use when your modem is not connected.