How to configure IP address in RHEL server?

Introduction

In this article we are going to cover how to configure the IP address and what all are the initial checks up we need to perform before you configure the IP address.

Every system in a network needs an IP address to communicate with another system, it can be easily configured in RHEL with the help of “ifconfig” command.

Types if IP:

IP address can be configured in two ways

1)Static IP

2)Dynamic IP

Static IP:

The IP can be configured manually by the system administrator or by individuals.Static IP mostly use with the devices like router, printer etc…

Dynamic IP:

In this method, the IP address is automatically configured from the DHCP server, when you set the IP should configure automatically in the network management tool then the system will call the DHCP server for the IP address, DHCP service provides the IP address to the system when it joins the network.

Procedure to configure the IP address:

1)Check how many adapters available and its status from your server

2)Choose the adapter to which you are going to configure

3)Deactivate the network adapter before you assign IP address

4)Configure the IP with the help of “ifconfig” command

5)Make the assigned IP address permanent with the help of “setup” command.

6)After assigned the IP address permanently to the network management file activate the network adapter.

Configure the IP address:

Method: Static IP

To check the network adapter status:
#ifconfig

from the above output, we have only one adapter connected to the server and the logical name for the network adapter is “eth0”, the current IP address for the adapter is 10.0.2.15 and the adapter is in running state.

eth0 –>eth indicates the adapter manufacturer name and “0” indicates the first adapter .if  the server is having two network adapter means it would display as eth1.

Note: You don’t have to worry about the  adapter names and numbers since the kernel device driver will generate all these by default.

To deactivate the network adapater:

syntax:

#ifdown   <Network adapatername>
#ifdown   eth0

Now check the network adapter status whether it is successfully deactivated or not

#ifconfig

From the output, eth0 adapter has been turned in to deactivated mode successfully

Now let us configure the IP address to the eth0 adapter by  using the following command:

syntax:

#ifconfig   <Network adapter>  <ipaddress>
#ifconfig  eth0   10.250.1.50

Check whether the IP is assigned to the eth0 adapter

#ifconfig  eth0

from the output, you could see the IP 10.250.1.50 has been successfully assigned

Note: Now if you deactivate the adapter , next time when you bring it back to the activate state, the IP will get assigned from the DHCP service.This is the default mode in RHEL.Below is the screenshot how the IP get assigned automatically after deactivate and activate the eth0 adapter👇👇

Now its time to make this ip address permanent by using the following command
#setup

From this tool choose the network configuration

Now choose edit devices

Choose the eth0 device from the option

Now check the default setting for the network adapter devices

From the above screenshot, you could find the default mode to configure the IP is in DHCP always.

Now Unselect the DHCP mode and add your static IP here to make it permanent one

Note: Use spacebar from your keyboard to deselect the DHCP

We have now successfully added the static IP 10.250.1.50 to the adapter eth0.

That’s it…Now save the information and exit the network management tool

 

Now activate the network adapater:

syntax:

#ifup  <network adapater>
#ifup  eth0

So from now onwards 10.250.1.50 is the default IP address for your server , even after restart , deactivate and activate the adapter this IP would be the permanent one.

#ifconfig eth0

From the above output, the IP has been permanently activated with the static method.

Note:

If you forget to add the IP address in the network management with the “setup” command then the assigned IP would be a temporary one,if you do a restart or deactivate and activate the adapter it will assign the IP from the DHCP server since in RHEL the default mode after restart or activate the network adapter will be in Dynamic IP mode.

Tips and tricks:

*If you are facing issues while you bringing up your network adapter or assigning the IP address just try to restart the network management service

#service NetworkManagement restart

The above command will do a refresh on all the network adapter configuration files and then try to configure or activate the adapter.

I hope you have enjoyed this article, in our next tutorial I will explain you the troubleshooting concepts in IP configuration.

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About Author:

Hello readers! Let me introduce my self first. My name is Vasanth Nirmal Singh J S having 9+ years of experience in IT on all flavours of Unix operating systems ,Storage's and many more .. I would like to share my technical experience i have come across - can be help to other people. So in this blog, I'll post my thoughts related to ITIS. I'll share experiences that I've had while working in different environments. You can expect content related to Unix,Solaris,Linux,EMC Storeages,HP-UX and many others. I hope this blog can be useful for you! Your comments will be appreciated!

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