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AirLink MP User Guide
12
Special MP modem modes such as GPS that are supported on a serial port are
also available on the virtual port. For example, with the virtual port enabled, a
mapping application on your computer that normally listens for GPS messages on
a serial port listens for those same messages on the virtual port.
Networking
IPSec
IP protocol that drives the Internet is inherently insecure. Internet Protocol
Security (IPSec), which is a standards-based protocol, secures communications
of IP packets over public networks.
IPSec is a common network layer security control and is used to create a virtual
private network (VPN).
The advantages of the IPSec feature includes:
•
Data Protection: Data Content Confidentiality allows users to protect their
data from any unauthorized view, because the data is encrypted (encryption
algorithms are used).
•
Access Control: Access Control implies a security service that prevents
unauthorized use of a Security Gateway, a network behind a gateway or
bandwidth on that network.
•
Data Origin Authentication: Data Origin Authentication verifies the actual
sender, thus eliminating the possibility of forging the actual sender's identifi-
cation by a third-party.
•
Data Integrity: Data Integrity Authentication allows both ends of the communi-
cation channel to confirm that the original data sent has been received as
transmitted, without being tampered with in transit. This is achieved by using
authentication algorithms and their outputs.
The IPSec architecture model includes the Sierra Wireless AirLink modem as a
remote gateway at one end communicating, through a VPN tunnel, with a VPN
gateway at the other end. The remote gateway is connected to a Remote network
and the VPN is connected to the Local network. The communication of data is
secure through the IPSec protocols.
Figure 1-3: IPSec Architecture
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