Linux Network Configuration Command Line

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In this blog, you’ll come to know Linux Network Configuration Command Line

Steps to Configure Network in Linux:

Contents Collapse
Steps to Configure Network in Linux:
Linux Network related commands:
Linux Network Related Files:
Help-Notes for above configuration:
Linux Network Commands
If you don’t have DNS Server in your Organization:
How it works:
What to do entry in Host file:
How to Set hostname:
Temporary change the hostname:
  • Setup IP Address
  • Setup Gateway
  • Setup NetMask
  • Name Resolution using /etc/hosts
  • Name Resolution using DNS
  • Setup Hostname

Linux Network related commands:

  • ip route
  • ip addr
  • ifconfig
  • hostname
  • ping
  • dig
  • service

Linux Network Related Files:

  • /etc/sysconfig/network-scripts/ifcfg-eth0
  • /etc/sysconfig/network
  • /etc/resolv.conf
  • /etc/hosts

Eg:

cat /etc/sysconfig/network-scripts/ifcfg-eth0

DEVICE=eth0
BOOTPROTO=dhcp
ONBOOT=yes
TYPE=Ethernet
USERCTL=yes
PEERDNS=yes
Help-Notes for above configuration:
ONBOOT=yes                      // when host is booted this configuration will be set

BOOTPROTO=none/DHCP             //DHCP - Automatically IP Address set from the router/network
                                //NONE - If you want to define manual IP address

DNS1=<your router DNS IP>       //Used for Name Resolution (IP-to-Name vice versa)

GATEWAY=<Router Private IP>     //This Define from where network traffic will flow from one N/W to other N/w

After Network Configuration restart the network service

Linux Network Commands
$ service network restart
If you don’t have DNS Server in your Organization:

You can do the entry in /etc/hosts do the entry of your hostname and IP address.

How it works:

When you ping to your own machine with hostname, first it will go to your /etc/hosts file it will search hostname if it found the hostname then the IP Address is found from their and ping command start working(getting a response)

What to do entry in Host file:
<your machine ip> <FQDN> <your hostname>                  //remove “<>” this.

Eg: 172.168.8.12                sshinde@rhel.com         sshinde
How to Set hostname:

To change hostname permanently goto below file: 

vi /etc/sysconfig/network

Even after a reboot, this hostname will be permanent as per the entry in the network file.

Temporary change the hostname:
hostname sshinde
After reboot, this hostname will be lost, it will display the hostname which is there in /etc/sysconfig/network file

End of the article, Linux Network Configuration Command Line.

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