Table of Contents
Advertisement
DI-206 ISDN Remote Router
Appendix B - IP Concepts
This appendix describes some basic IP concepts, the TCP/IP addressing scheme and show
how to assign IP Addresses.
When setting up the router, you must make sure all ports to be utilized on the router have
valid IP addresses. Even if you will not use the ISDN or WAN ports, you should, at the very
least, make sure the LAN port is assigned a valid IP address. This is required for telnet, in-
band SNMP management, and related functions such as "trap" handling and TFTP firmware
download.
IP Addresses
The Internet Protocol (IP) was designed for routing data between network sites all over the
world, and was later adapted to allow routing between networks (often referred to as
"subnets") within any site. IP includes a system by which a unique number can be assigned to
each of the millions of networks and each of the computers on those networks. Such a
number is called an IP address.
To make IP addresses easy to understand, the originators of IP adopted a system of
representation called "dotted decimal" or "dotted quad" notation. Below are examples of IP
addresses written in this format:
Each of the four values in an IP address is the ordinary decimal (base 10) representation of a
value that a computer can handle using eight "bits" (binary digits — 1s and 0s). The dots are
simply convenient visual separators.
Zeros are often used as placeholders in dotted decimal notation; 189.21.241.56 can therefore
also appear as 189.021.241.056.
IP networks are divided into three classes on the basis of size. A full IP address contains a
network portion and a "host" (device) portion. The network and host portions of the address
are different lengths for different classes of networks, as shown in the table below.
158
Concepts
201.202.203.204
189.21.241.56
125.87.0.1
Appendix B - IP
Advertisement
Table of Contents
