Sierra Wireless AirLink MP Guía de usuario descargar pdf (Pagina 80)

ALEOS User Guide

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Dynamic DNS

Dynamic DNS allows a AirLink Device WAN IP address to be published to

approprietary Sierra Wireless dynamic DNS service called IP Manager.

If you have a fleet of Sierra Wireless AirLink devices 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 devices connect to the cellular

network. If you need to connect to a gateway, 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 device 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 device 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 the AirLink device directly, a device connected to

the AirLink device, or a host system using your AirLink device (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 AirLink device is

connected and can change each time the gateway reconnects to the network.

• Static IP addresses are granted the same address every time your AirLink

device is connected and are not in use when your gateway is not connected.

Since many cellular providers, like wire-based ISPs, do not offer static IP

addresses or static address accounts cost a premium vs. dynamic accounts,

Sierra Wireless AirLink Solutions developed IP Manager to work with a Dynamic

DNS server to receive notification from Sierra Wireless AirLink devices to

translate the dynamic IP address to a fully qualified domain name. Thus, you can

contact your AirLink device directly from the Internet using a domain name.

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Sierra Wireless AirLink MP Guía de usuario Pagina 80