ZyXEL Communications NXC-8160, User Manual

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Chapter 3 LAN Settings
NXC-8160 User’s Guide
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this block of addresses specifically for private use; please do not use any other number unless
you are told otherwise. If you select 192.168.1.0 as the network number; it covers 254
individual addresses, from 192.168.1.1 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, 192.168.1.10, for your NXC-8160, 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 NXC-8160 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 NXC-8160 unless you are instructed to do
otherwise.
Private IP Addresses
Every machine on the Internet must have a unique address. If your networks are isolated from
the Internet, for example, only between your two branch offices, you can assign any IP
addresses to the hosts without problems. However, the Internet Assigned Numbers Authority
(IANA) has reserved the following three blocks of IP addresses specifically for private
networks:
• 10.0.0.0 — 10.255.255.255
• 172.16.0.0 — 172.31.255.255
• 192.168.0.0 — 192.168.255.255
You can obtain your IP address from the IANA, from an ISP or it can be assigned from a
private network. If you belong to a small organization and your Internet access is through an
ISP, the ISP can provide you with the Internet addresses for your local networks. On the other
hand, if you are part of a much larger organization, you should consult your network
administrator for the appropriate IP addresses.
"
Regardless of your particular situation, do not create an arbitrary IP address;
always follow the guidelines above. For more information on address
assignment, please refer to RFC 1597,
Address Allocation for Private Internets
and RFC 1466, Guidelines for Management of IP Address Space.