User guide

GX400 HSPA+ User Guide
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Connecting to Your Cellular Provider
The GX400 uses your cellular provider as an ISP (Internet Service Provider) to
connect you to the Internet.
Connection Steps:
1. When the GX400 is powered on, it automatically searches for cellular service.
2. The GX400 establishes a communications link to the cellular provider with the
radio module.
3. When the GX400 has received its IP address from the cellular provider, a
connection to the Internet or the cellular network is also available for
computers or other devices connected directly to the GX400.
The GX400 will perform routing for all internet traffic to and from the computers or
other end devices.
When the GX400 is configured for Ethernet or USB/net, use Public IP mode. Only
one device connected to the applicable interface will receive the Public IP address
which is the one provided by the cellular network. In Private mode, all hosts use
Private IPs. With a hub or switch connected to the Ethernet port, the GX400 will
provide NAT (network address translation) for a range of computers or other
devices connected to the switch or hub and Internet access to all of them.
Dynamic vs. Static IP Addresses
There are two types of addresses on networks: dynamic and static.
• Dynamic addresses are assigned on a “need to have” basis. Your GX400
might not always receive the same address each time it connects with your
cellular provider.
• Static addresses are permanently assigned to a particular account and will
always be used whenever your GX400 connects to the Internet. The IP
address will not be given to anyone else.
Most ISPs (cellular included) use dynamic IP addresses rather than static IP
addresses since it allows them to reuse a smaller number of IP addresses for a
large number of customers. A dynamic IP address is suitable for many common
Internet uses, such as web browsing, looking up data on another computer
system, or other client functions (such as data only being sent out or only being
received after an initial request).
Tip: If your account with your cellular provider includes a dynamic IP address and you
need a static IP, please consult your your cellular provider representative for more
information about changing your account for static IP support.
If you need to contact your GX400, a device connected to the GX400, or a host
system using the GX400 from the Internet, you need to have a known IP (such as
one which is static) or domain name (an IP address which is converted by a DNS
server into a word based name). If you have a dynamic IP address for your
modem, you can use a Dynamic DNS service (such as IP Manager) to translate
your IP address into to a domain name.