ZyXEL Communications AMG1302-T series User Manual page 272

Appendix B IP Addresses and Subnetting
Once you have decided on the network number, pick an IP address for your AMG1302/AMG1202-
TSeries that is easy to remember (for instance, 192.168.1.1) 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 AMG1302/AMG1202-
TSeries 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 AMG1302/AMG1202-TSeries 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 (running only between two branch offices, for example) 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
• 172.16.0.0
• 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.
272
— 10.255.255.255
— 172.31.255.255
AMG1302/AMG1202-TSeries User's Guide