Network Router User Manual
Table Of Contents
- IOLINK-520 and IOLINK-PRO USER AND SYSTEM ADMINISTRATION GUIDE
- Installation
- Typical Applications & How to Configure Them
- 2.1 - Bridging and Routing
- Should You Bridge or Route?
- 2.2 Basic WAN Configurations
- 2.3 - Configure Remote Site Profiles
- 2.4 Advanced Features
- Introductionto Filtering
- Appendix AMenu Trees
- Appendix BOctet Locations on Ethernet Frames
- Appendix CServicing Information
- Opening the case
- Identifying the Internal Components
- To Clear a “Lost” Password
- Changing LAN or WAN Interfaces
- Selecting MDI or MDI-X LAN Interface
- Installing the ISDN Link Modules
- Processor settings for the ISDN Link Modules
- Changing the Termination Straps on the ISDN S/T Interface
- Connecting to the ISDN-U Link Module
- Performing a Software Upgrade
- Appendix DInterface Pinouts
- Pinout Information
- Link Clocking Information
- ATL-CSU/DSU Link Module Information
- Console Pinouts
- V.24 & RS232C Link Pinouts
- V.11/X.21 Link Pinouts
- RS442 & RS530 Link Pinouts
- V.35 Link Pinouts
- RS232 Null-Modem Cable Configuration
- V.35 Null-Modem Cable Configuration
- RS530 Null-Modem Cable Configuration
- RS530 To RS449 Conversion Cable
- V.11/X.21 Null-Modem Cable Configuration
- Index
- Warranty
Applications
IOLINK-520 & IOLINK-PRO Installation & Applications Guide —
2.5
2.1. 2 .1 - IP Addressing
Devices on an IP network are located by their IP addresses, which is a 32 bit number
divided into four 8 bit fields. The IP address identifies both the network and the host device
(also known as a node) on that network. The address is usually written as the four decimal
values for the fields (between 0 and 255) separated by decimal points; for example
196.65.43.21.
The high order field defines the IP class of the address. There are three commonly used
classes of standard IP addresses:
A: 1 to 127
B: 128 to 191
C: 192 to 223
For Class A addresses, only the first 7 bits of the high order field represents the network
address, so there can be 127 networks. The remaining three fields are the host portion of the
address – there can be over 16 million (2
24
) host devices on each class A network.
Class B uses the first two fields for network addresses and can address approximately 16,000
networks. The two low order fields allow approximately 65,000 host addresses (2
16
) for each
network.
Class C uses three high order fields to address over 2 million networks; the low order field is
used to address up to 253 hosts (the addresses with all bits set to 1 and all 0 are reserved for
network use; so addresses available from 8 bits = 255 minus the 2 reserved).
IP addresses within a private network may be assigned arbitrarily, however, if that network is
to interconnect with the global Internet, it is necessary to obtain a registered IP address.
For example, a small company is connected to the Internet; they are assigned a single class C
IP network address (199.169.100.0). This network address allows the company to define up
to 253 host addresses within their network.