Ch 25 Networking

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Linux Networking : Scope of this document will be How to assign IP , Networking Tool , Ports and Misc Network settings

Assigning IP : There are two methods for Manual assigning IP to your Linux Box if it is not assign during the installation, if you have DHCP server in your Network Linux machine can get the IP from DHCP server.

IP Assigning using GUI/TUI Mode :

1. system-config-network : and follow the screen and update IP, DNS and Hostname related stuff

2. system-config-network-tui : this will open Terminal Graphical windows which can be operated using

Space Arrow and Enter key same as above method IP,DNS and Hostname.

IP Assigning using File Editing :

Fedora / Redhat / Centos and all other Linux distribution following Redhat release has following Network Directory Structure.

# /etc/sysconfig/network-scrips/ifcfg-eth[N] e.g ifcfg-eth0

#vi /etc/sysconfig/network-scrips/ifcfg-eth0

DEVICE=eth0

NM_CONTROLLED=no

ONBOOT=yes

IPADDR=10.21.22.162

BOOTPROTO=on

NETMASK=255.255.0.0

DNS2=10.21.2.14

TYPE=Ethernet

GATEWAY=10.21.1.1

DNS1=10.21.2.220

IPV6INIT=no

USERCTL=no

HWADDR=00:50:56:9C:BE:9B

PREFIX=16

DEFROUTE=yes

IPV4_FAILURE_FATAL=yes

If you want to add Permanent Virtual IP to your system Here are the steps:

# cp /etc/sysconfig/network-scrips/ifcfg-eth0 /etc/sysconfig/network-scrips/ifcfg-eth0:0

# vi /etc/sysconfig/network-scrips/ifcfg-eth0:0

DEVICE=eth0:0