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What You Will Choose
14 Megabit Modem 400F, 500L, 600F, and 700F User Manual
WHAT YOU WILL CHOOSE
Before configuring the modem, consider the options in the following “Configuration” section.
Ensure that you have the appropriate power cable for your facility as described below in the
“Power Cable” section.
Configuration
You can choose to use:
• Network Address Translation (NAT) protocol. This protocol includes both basic NAT and
Network Address Port Translaton (NAPT). Basic NAT uses a one-to-one mapping of a
private IP address and a public IP address. NAPT uses a multiple-to-one mapping of
multiple IP addresses and their ports to a single IP address and its ports. For more
information about the NAT protocol, see “NAT” on page 87.
• Domain Name System (DNS) resolution. You must specify the IP address for a device to
serve as the DNS resolver. You can also specify a second IP address to designate another
device to serve as a secondary DNS resolver. The DNS device maps human-readable
addresses to IP addresses. For simplicity and ease of management, use DNS relay. DNS
relay allows the LAN hosts to configure the Megabit Modem as the DNS server. Depending
on the host sending the DNS message and what session it is assigned to, the Megabit
Modem will relay the message to the appropriate DNS server. For more information about
DNS resolution, see “DNS Resolution” on page 93.
• TFTP server for downloading software updates to the modem. You specify the IP address,
subnet mask, and directory path (where software updates are located) for the device that
will be the TFTP server.
Power Cable
The Megabit Modem 400F, 500L, 600F, and 700F are available with a variety of power supplies
and power cords. When you order your modem, choose one of the following as the last number
in the product part number (example: use 150-2122-7x for the 700F) for your order to indicate
which power option you need:
• 2 indicates a power supply for International use and does not include a power cord.
• 3 indicates a power supply for North American use and includes a North American
power cord.
• 4 indicates a Universal power supply and includes a European power cord.
• 5 indicates a Universal power supply and includes a UK/Ireland power cord.