ITTABLES [A table where all the IT Professionals meet]: July 2012

Network Configuration.

IP Addressing

An IP address is a numeric identifier assigned to each machine on an IP network. It designates the specific location of a device on the network.

We can assign IP Address to computer by using two methods

1. Static [ Manually ]

2. Dynamic [ Using DHCP Server ]

There are three methods for depicting IP Addresses

1. Dotted Decimal :- 10.2.11.10

2. Binary :- 00001010.00000010.00001011.00001010

3. Hexa-Decimal :- A.2.B.A

IP Address Classes :-

Classes IP Range Octet Network ID / Host ID

Class A 0-127 8.8.8.8 N.H.H.H

Class B 128-191 8.8.8.8 N.N.H.H

Class C192-223 8.8.8.8 N.N.N.H

Class D 224-239 8.8.8.8 N.N.N.N

Class E240-255 8.8.8.8 N.N.N.N

1. To view IP Address.

[root@server1 ~]#ifconfig

2. To set IP Address.

[root@server1 ~]#setup

1. Under Choose a Tool Dialog Box select Network configuration and press ENTER

2. Under Select Action Dialog Box select Device configuration and press ENTER

3. Under Select A Device Dialog Box select eth0 (eth0) – Ethernet and press ENTER

4. Under Network Configuration Dialog Box add following entries

Name eth0

Device eth0

Use DHCP [*]

Static IP This setting is applicable if DHCP server is

Netmask configured and machine will get IP from it

Default gateway IP or else you need to set static IP for a machine

Primary DNS Server

Secondary DNS Server

Name eth0

Device eth0

Use DHCP [] to uncheck * press spacebar and set static IP.

Static IP 10.0.0.1 for a machine use this settings.

Netmask 255.0.0.0

Default gateway IP

Primary DNS Server

Secondary DNS Server

Select on Ok and press ENTER.

5. Select Save and press ENTER.

6. Select Save&Quit and press ENTER

7. SelectQuit and press ENTER

[root@server1 ~]#ifconfig

[root@server1 ~]#service network restart

[root@server1 ~]#ping 10.0.0.1

3. To add another Ethernet id and set IP for it.

[root@server1 ~]#setup

1. Under Choose a Tool Dialog Box select Network configuration and press ENTER

2. Under Select Action Dialog Box select Device configuration and press ENTER

3. Under Select A Device Dialog Box select and press ENTER

4. Under Network Configuration select Ethernet and press ENTER or select ADD

Now set Ethernet device name and IP address

Name eth1

Device eth1

Use DHCP [] to uncheck * press spacebar and set static IP.

Static IP 10.0.0.10 for a machine use this settings.

Netmask 255.0.0.0

Default gateway IP

Primary DNS Server

Select on Ok and press ENTER.

5. Select Save and press ENTER.

6. Select Save&Quit and press ENTER

7. SelectQuit and press ENTER

[root@server1 ~]#ifconfig

[root@server1 ~]#service network restart

[root@server1 ~]#ping 10.0.0.1

3. To view network configuration file.

[root@server1 ~]#cat /etc/sysconfig/network-scripts/ifcfg-eth0

DEVICE=eth0

NM_CONTROLLED=yes

ONBOOT=yes

IPADDR=10.0.0.1

BOOTPROTO=none

NETMASK=255.0.0.0

TYPE=Ethernet

IPV6INIT=no

USERCTL=no

HWADDR=00:0C:29:E4:E8:D4

PREFIX=8

DEFROUTE=yes

IPV4_FAILURE_FATAL=yes

NAME=”System eth0”

UUID=5fb06bd0-0bb0-7ffb-45f1-d6edd65f3e03

4. To change hostname of a computer using file.

[root@server1 ~]#cat /etc/sysconfig/network

NETWORKING=yes

HOSTNAME=server1

5. To change IP address temporary.

[root@server1 ~]#ifconfig

eth2 inet addr : 100.0.0.1 Bcast: 100.255.255.255 Mask: 255.0.0.0

[root@server1 ~]#ifconfig eth2 20.0.0.1

[root@server1 ~]#ifconfig

eth2 inet addr : 20.0.0.1 Bcast: 20.255.255.255 Mask: 255.0.0.0

[root@server1 ~]#service network restart

[root@server1 ~]#ifconfig

eth2 inet addr : 100.0.0.1 Bcast: 100.255.255.255 Mask: 255.0.0.0

5. To create temporary alternate IP address .

[root@server1 ~]#ifconfig

eth2 inet addr : 100.0.0.1 Bcast: 100.255.255.255 Mask: 255.0.0.0

[root@server1 ~]#ifconfig eth2:0 20.0.0.1

[root@server1 ~]#ifconfig

eth2:0 inet addr : 20.0.0.1 Bcast: 20.255.255.255 Mask: 255.0.0.0

[root@server1 ~]#service network restart

[root@server1 ~]#ifconfig

6. To create permanent alternate IP address temporary.

[root@server1 ~]#cd /etc/sysconfig/network-scripts

[root@server1 network-scripts]#vi ifcfg-eth2:0

DEVICE=eth0:0

ONBOOT=yes

IPADDR=200.0.0.1

BOOTPROTO=static

NETMASK=255.0.0.0

TYPE=Ethernet

NM_CONTROLLED=no

:wq!

[root@server1 network-scripts]#service network restart

[root@server1 network-scripts]#ifconfig

Note:- Whenever you assign temporary ip address or temporary lan card after you restart the network services the temporary settings will disappear.

VI Editor

1. Command Mode :- In this mode you can edit the files using basic commands.

2. Insert Mode :- In this mode you can edit the file normally.

3. ESC Mode :- this mode is used to escape from certain mode. Eg. Escape from insert mode and go to command mode.

Command Mode Commands

1. x To delete the character.

2. alt+u To undo the changes.

3. $ To take the cursor end of the line.

4. ^ To take the cursor start of the line.

5. { To take the cursor start of the paragraph.

6. } To take the cursor end of the paragraph.

7. ( To take the cursor start of the sentence.

8. ) To take the cursor end of the sentence.

9. w To take the cursor next word.

10. b To take the cursor back word.

11. k Used for up arrow key.

12. j Used for down arrow key.

13. h Used for left arrow key.

14. l Used for right arrow key.

15. yy To copy a specific no.’s of lines.

16.p To paste copied lines.

17. dd To delete specific no.’s of lines.

18. shift+r or R To replace the line

19. r To replace the character.

20. o To create a blank line below the cursor.

21. O To create a blank line above the cursor.

22. i Go to Insert mode

23. :q To exit without saving the file.

24. :q! To exit without saving the file forcefully.

25. :wq To save and exit the file.

26. :wq! To save and exit the file forcefully.

27. :se nu To see numbers

28: :se no nu To remove numbers

VI editor Tutorial

1. To create file using VI

[root@server1~]# vi filename ………

to inter into insert mode and type the following text in it

Hello!!!!!!!!

Good Morning Everyone

Welcome to CMS Computer Institute

ESC> ………. TO EXIT FROM INSERT MODE

:wq! ……… TO SAVE AND EXIT

[root@server1~]# cat filename

Hello!!!!!!!!

Good Morning Everyone

Welcome to CMS Computer Institute

2. To Copy and Paste the lines using Vi editor

[root@server1~]# vi filename ………

Hello!!!!!!!!

Good Morning Everyone [ move your cursor to specific line which you want to copy and type yy and move your cursor were you want to paste that line

Welcome to CMS Computer Institute and type p ]

Good Morning Everyone

PRESS ESC> ………. TO EXIT FROM INSERT MODE

:wq! ……… TO SAVE AND EXIT

[root@server1~]#

3. To Delete the lines using Vi editor

[root@server1~]# vi filename ………

Hello!!!!!!!!

Good Morning Everyone [ move your cursor to specific line which you want to delete and type dd ]

Welcome to CMS Computer Institute

Good Morning Everyone

PRESS ESC> ………. TO EXIT FROM INSERT MODE

:wq! ……… TO SAVE AND EXIT

[root@server1~]#

4. Move the Cursor end of the line.

[root@server1~]# vi filename ………

Hello!!!!!!!!

Good Morning Everyone [ take your cursor start of the line and type shift+$ to move end on the line]

Welcome to CMS Computer Institute

ESC> ………. TO EXIT FROM INSERT MODE

:wq! ……… TO SAVE AND EXIT

5. Move the Cursor start of the line.

[root@server1~]# vi filename ………

Hello!!!!!!!!

Good Morning Everyone [ take your cursor start of the line and type shift+^ to move start on the line]

Welcome to CMS Computer Institute

ESC> ………. TO EXIT FROM INSERT MODE

:wq! ……… TO SAVE AND EXIT

6. Move the Cursor end of the paragraph.

[root@server1~]# vi filename ………

Hello!!!!!!!!

Good Morning Everyone [ take your cursor start of the line and type shift+} to move end on the paragraph ]

Welcome to CMS Computer Institute

ESC> ………. TO EXIT FROM INSERT MODE

:wq! ……… TO SAVE AND EXIT

7. Move the Cursor start of the paragraph.

[root@server1~]# vi filename ………

Hello!!!!!!!!

Good Morning Everyone [ take your cursor end of the paragraph and type shift+{ to move start of the paragraph ]

Welcome to CMS Computer Institute

ESC> ……….

:wq! ………

To replace the character.

[root@server1~]#vi filename [ move your cursor to specific word which you want to

Welcome to CSS replace and press r and do the changes ]

Welcome to CMS

:wq! ………

Pages

Network Configuration

VI editor Tutorial