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DI-206 ISDN Remote Router
The value(s) in the host portion of a physical device's IP address can be in the range of 0
through 255 as long as this portion is not all-0 or all-255. Values outside the range of 0 to
255 can never appear in an IP address (0 to 255 is the full range of integer values that can be
expressed with eight bits).
The network portion must be the same for all the IP devices on a discrete physical network
(a single Ethernet LAN, for example, or a WAN link). The host portion must be different
for each IP device — or, to be more precise, each IP-capable port or interface — connected
directly to that network.
The network portion of an IP address will be referred to in this manual as a network number;
the host portion will be referred to as a host number.
To connect to the Internet or to any private IP network that uses an Internet-assigned
network number, you must obtain a registered IP network number from an Internet-
authorized network information center. In many countries you must apply through a
government agency, however they can usually be obtained from your Internet Service
Provider (ISP).
If your organization's networks are, and will always remain, a closed system with no
connection to the Internet or to any other IP network, you can choose your own network
numbers as long as they conform to the above rules.
If your networks are isolated from the Internet, e.g. only between your two branch offices,
you can assign any IP Addresses to hosts without problems. However, the Internet Assigned
Numbers Authority (IANA) has reserved the following three blocks of IP Addresses
specifically for private (stub) networks:
It is recommended that you choose private network IP Addresses from the above list. For
more information on address assignment, refer to RFC 1597, Address Allocation for Private
Internets and RFC 1466, Guidelines for Management of IP Address Space.
Subnet Mask
In the absence of subnetworks, standard TCP/IP addressing may be used by specifying subnet
masks as shown below.
160
Concepts
Class
Beginning Address
A
10.0.0.0
B
172.16.0.0
C
192.168.0.0
Ending Address
10.255.255.255
172.31.255.255
192.168.255.255
Appendix B - IP
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