Raven and PinPoint CDMA User Guide Version 1.12
AirLink Communications, Inc. Page 25 March 24, 2004
Many modern wireless data technologies use dynamic IP addresses rather than static
IP addresses. This poses a problem for AirLink customers since they cannot contact
their modems unless their addresses are known. AirLink offers a family of solutions
designed for the different situations existing with our customers. One of the
solutions, an IPManager System that implements a wireless Dynamic Domain Name
Server, DDNS.
IPManager is a system which tracks the current IP address which a modem has been
assigned. The DDNS system consists of three main components. One component is a
task in the modem firmware which issues an update notification to the IPManager
server when the modem is assigned a new IP address. The second component is the
IPManager server which receives IP change notifications from all modems and
updates a DNS server, the third component. It may, optionally, log the latest known
IP address in a database, which may be accessed to see a history of the IP updates.
Customers may then use the wireless Dynamic DNS server to obtain the current IP
of an AirLink modem. The following diagram shows the IPManager system elements.
Internet
3G
Network
Firewall
DNS
IPManager
DB
DNS
DNS Servers may be
inside or outside the
firewall