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6.7 Technical Reference
The following section contains additional technical information about the WiMAX Modem
features described in this chapter.
6.7.1 IP Address and Subnet Mask
Similar to the way houses on a street share a common street name, computers on a LAN share
one common network number.
Where you obtain your network number depends on your particular situation. If the ISP or
your network administrator assigns you a block of registered IP addresses, follow their
instructions in selecting the IP addresses and the subnet mask.
If the ISP did not explicitly give you an IP network number, then most likely you have a single
user account and the ISP will assign you a dynamic IP address when the connection is
established. If this is the case, it is recommended that you select a network number from
192.168.0.0 to 192.168.255.0 and you must enable the Network Address Translation (NAT)
feature of the WiMAX Modem. The Internet Assigned Number Authority (IANA) reserved
this block of addresses specifically for private use; please do not use any other number unless
you are told otherwise. Let's say you select 192.168.1.0 as the network number; which covers
254 individual addresses, from 192.168.100.1 to 192.168.1.254 (zero and 255 are reserved). In
other words, the first three numbers specify the network number while the last number
identifies an individual computer on that network.
Once you have decided on the network number, pick an IP address that is easy to remember,
for instance, 192.168.100.1, for your WiMAX Modem, but make sure that no other device on
your network is using that IP address.
The subnet mask specifies the network number portion of an IP address. Your WiMAX
Modem will compute the subnet mask automatically based on the IP address that you entered.
You don't need to change the subnet mask computed by the WiMAX Modem unless you are
instructed to do otherwise.
6.7.2 DHCP Setup
DHCP (Dynamic Host Configuration Protocol, RFC 2131 and RFC 2132) allows individual
clients to obtain TCP/IP configuration at start-up from a server. You can configure the
WiMAX Modem as a DHCP server or disable it. When configured as a server, the WiMAX
Modem provides the TCP/IP configuration for the clients. If DHCP service is disabled, you
must have another DHCP server on your LAN, or else each computer must be manually
configured.
The WiMAX Modem is pre-configured with a pool of IP addresses for the DHCP clients
(DHCP Pool). See the product specifications in the appendices. Do not assign static IP
addresses from the DHCP pool to your LAN computers.
These parameters should work for the majority of installations. If your ISP gives you explicit
DNS server address(es), see
User's Guide
Chapter 6 The LAN Configuration Screens
Section 6.3 on page
61.
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