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261

Using the K Desktop Environment (KDE)

Follow the steps below to configure your computer IP address using the KDE.

1

Click the Red Hat button (located on the bottom left corner), select

System Setting

and click

Network

.

Figure 150

Red Hat 9.0: KDE: Network Configuration: Devices

2

Double-click on the profile of the network card you wish to configure. The

Ethernet Device

General

screen displays as shown.

Figure 151

Red Hat 9.0: KDE: Ethernet Device: General

•

If you have a dynamic IP address, click

Automatically obtain IP address settings with

and

select

dhcp

from the drop down list.

•

If you have a static IP address, click

Statically set IP Addresses

and fill in the

Address

,

Subnet mask

, and

Default Gateway Address

fields.

3

Click

OK

to save the changes and close the

Ethernet Device General

screen.

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4

If you know your DNS server IP address(es), click the

DNS

tab in the

Network Configuration

screen. Enter the DNS server information in the fields provided.

Figure 152

Red Hat 9.0: KDE: Network Configuration: DNS

5

Click the

Devices

tab.

6

Click the

Activate

button to apply the changes. The following screen displays. Click

Yes to save

the changes in all screens.

Figure 153

Red Hat 9.0: KDE: Network Configuration: Activate

7

After the network card restart process is complete, make sure the

Status

is

Active

in the

Network

Configuration

screen.

Using Configuration Files

Follow the steps below to edit the network configuration files and set your computer IP address.

1

Assuming that you have only one network card on the computer, locate the

ifconfig-eth0

configuration file (where

eth0

is the name of the Ethernet card). Open the configuration file with

any plain text editor.

•

If you have a dynamic IP address, enter

dhcp

in the

BOOTPROTO=

field. The following figure

shows an example.

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263

Figure 154

Red Hat 9.0: Dynamic IP Address Setting in ifconfig-eth0

•

If you have a static IP address, enter

static

in the

BOOTPROTO=

field. Type

IPADDR

= followed

by the IP address (in dotted decimal notation) and type

NETMASK

= followed by the subnet

mask. The following example shows an example where the static IP address is 192.168.1.10

and the subnet mask is 255.255.255.0.

Figure 155

Red Hat 9.0: Static IP Address Setting in ifconfig-eth0

2

If you know your DNS server IP address(es), enter the DNS server information in the

resolv.conf

file in the

/etc

directory. The following figure shows an example where two DNS server IP

addresses are specified.

Figure 156

Red Hat 9.0: DNS Settings in resolv.conf

3

After you edit and save the configuration files, you must restart the network card. Enter

./network

restart

in the

/etc/rc.d/init.d

directory.

The following figure shows an example.

Figure 157

Red Hat 9.0: Restart Ethernet Card

Verifying Settings

Enter

ifconfig

in a terminal screen to check your TCP/IP properties.

DEVICE=eth0

ONBOOT=yes

BOOTPROTO=dhcp

USERCTL=no

PEERDNS=yes

TYPE=Ethernet

DEVICE=eth0

ONBOOT=yes

BOOTPROTO=static

IPADDR=

192.168.1.10

NETMASK=

255.255.255.0

USERCTL=no

PEERDNS=yes

TYPE=Ethernet

nameserver 172.23.5.1

nameserver 172.23.5.2

[root@localhost init.d]# network restart

Shutting down interface eth0:

[OK]

Shutting down loopback interface:

[OK]

Setting network parameters:

[OK]

Bringing up loopback interface:

[OK]

Bringing up interface eth0:

[OK]

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Figure 158

Red Hat 9.0: Checking TCP/IP Properties

[root@localhost]# ifconfig

eth0

Link encap:Ethernet

HWaddr 00:50:BA:72:5B:44

inet addr:172.23.19.129

Bcast:172.23.19.255

Mask:255.255.255.0

UP BROADCAST RUNNING MULTICAST

MTU:1500

Metric:1

RX packets:717 errors:0 dropped:0 overruns:0 frame:0

TX packets:13 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:100

RX bytes:730412 (713.2 Kb)

TX bytes:1570 (1.5 Kb)

Interrupt:10 Base address:0x1000

[root@localhost]#

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A

PPENDIX

B

IP Addresses and Subnetting

This appendix introduces IP addresses and subnet masks.

IP addresses identify individual devices on a network. Every networking device (including

computers, servers, routers, printers, etc.) needs an IP address to communicate across the

network. These networking devices are also known as hosts.

Subnet masks determine the maximum number of possible hosts on a network. You can also use

subnet masks to divide one network into multiple sub-networks.

Introduction to IP Addresses

One part of the IP address is the network number, and the other part is the host ID. In the same

way that houses on a street share a common street name, the hosts on a network share a common

network number. Similarly, as each house has its own house number, each host on the network has

its own unique identifying number - the host ID. Routers use the network number to send packets

to the correct network, while the host ID determines to which host on the network the packets are

delivered.

Structure

An IP address is made up of four parts, written in dotted decimal notation (for example,

192.168.1.1). Each of these four parts is known as an octet. An octet is an eight-digit binary

number (for example 11000000, which is 192 in decimal notation).

Therefore, each octet has a possible range of 00000000 to 11111111 in binary, or 0 to 255 in

decimal.

The following figure shows an example IP address in which the first three octets (192.168.1) are

the network number, and the fourth octet (16) is the host ID.