Network configuration in Linux

In this article we will discuss all those necessary steps which you need to perform before solving networking related questions in RHCE exam. Don't skip this tutorial, giving few minutes to this could save you from huge problems in exam. All steps are given in a sequences don't skip them .

Check LAN card driver is installed or not.

LAN driver is the top most part for network. To check it run setup command



Select network configuration from list



If you see LAN card here mean you have LAN driver



if you don't see here anything and Linux drop you back on list manu means you don't have LAN driver. Install is first.

Check proper IP configuration

All systems on RHCE exam should have an properly configured IP address. During this entire practical we are using three systems. There description is given below Check these systems for properly configured IP address.

Node	Operating system	Name	IP
PC1	Linux RHEL	Server	192.168.0.254
PC2	Linux RHEL	Client1	192.168.0.1
PC3	Windows XP	Client2	192.168.0.2

Change Host Name

If you have skipped hostname during installation then it would be localhost.localdomain. You can change hostname with hostname command but this change would be temporary. To change hostname permanently do editing in /etc/sysconfig/network.
set computer name as shown in table.

#vi /etc/sysconfig/network


On server system set it to Server and in client system set it Client1

Check /etc/hosts files for name resolution

Several Linux server depend name resolution. This file should have entry of all network systems. It will save you from naming related problem. In our network it should look like this on both Linux system Server and Client1

Check Firewall Status

Firewall is the necessary security part of Linux system which is connected to Internet. But in exam we are not going to use Internet so it’s good practice to disable it.

To disable firewall run setup commands



Now select firewall configuration from list and click on run tool



Select disable and click on ok and quit to return on command prompt.



System reboot require to take effect so reboot system with reboot -f commands

Check portmap and xinetd package status

Almost every Linux server needs these two rpm to function properly. First check that these rpm are install or not. If no rpm is install then install them via rpm commands.



If you have rpm then check there status via setup commands



Now select system service from menu


put a star in front the portmap service


Now put star in front the xinetd service



Click on ok and select quit to come back on command prompt
Now restart these two service.



To keep on these services after reboot on then via chkconfig command



After reboot verify their status. It must be in running condition



Once you have successfully completed these steps you are ready to configure the Linux server .