Multitech MT5634HD16 Uživatelská příručka stáhnout pdf (Strana 17)

1 Introduction

CommPlete Communications Server 7

Using PPP and TCP/IP with the RASExpress Server

IP Addressing

IP (Internet Protocol) addresses are 32-bit addresses used to uniquely identify devices

on a diversified network. An IP address is formatted as four groups of three digits

separated by periods, e.g., 204.220.153.001.

There are three classes of Internet addresses: A, B and C. Class A networks use the

first byte of the IP address for the network number, and the remaining three bytes for

the host number. The first byte must have a value from one through 127.

Class B networks use the first two bytes of the IP address for the network number,

and the last two bytes for the host number. The first byte must have a value from 128

through 191.

Class C networks use the first three bytes of the IP address for the network number,

and the last byte for the host number. This scheme provides for a very large number

of networks, each with up to 255 addressable devices. The first byte must have a

value from 192 through 223.

The part of the IP address that refers to the network is called the network address. A

network mask is a bit pattern that yields the network address in a Boolean AND op-

eration with the IP address. For example, in Class C networks, network addresses

take the form X.X.X.0. The network mask for Class C networks is 255.255.255.0. In all

IP addresses on a given network, the network address is the same, while the host part

of the address is different for each host or workstation.

Table 1. Internet Address Classes

Class Range Mask No. of Hosts Remarks

A 0–127 255.0.0.0 16,000,000 127 is reserved for loopback. None left.

B 128–191 255.255.0.0 65,384 16,384 possible networks

C 192–255 255.255.255.0 254 224–255 are reserved. 2,097,152

possible networks.

IP Addresses

If the RASExpress server is to be used on an existing IP network, make certain that

the network can allot an IP address for the RASExpress server and one IP address for

each line that will be configured for IP accessibility.

Within the port configuration there is an entry for IPCP that enables or disables the

ability to use IP and/or TCP/IP.

Address Mask

The mask configuration is typically set as the default mask for the class of the net-

work. For example, 255.0.0.0 is the mask for Class A, 255.255.0.0 for Class B, and

255.255.255.0 for Class C.

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Multitech MT5634HD16 Uživatelská příručka Strana 17