Group Discounts available for 3+ students and Corporate Clients



  • One of the key elements of connecting to different systems in the network configuration involved
  • A Network is a set of hardware devices connected together, either physically or logically to allow them to exchange information.
  • Network management is fairly easy when it comes to Ret Hat.
  • Most of the network configuration is kept in files; therefore, adjusting these settings is simple.
  • In the network system maintains the fully qualified domain name


\ F.Q.D.N = Hostname    +  Domain name


Let’s start by looking at the information about hostname & networking


  • To check the hostname: #hostname
  • To Managing hostname temporarily:  —>#hostname     server254
  • To Managing permanently: #vim /etc/sysconfig/network


HOSTNAME              = SERVER254


  • For avoiding graphical problems:

#vi /etc/hosts    Server254.    server254


  • To Manging IP – Address:
  • To check the ipaddress:

Syn:  if config [options]   [interface]

Options:         netmask



Ex:  # if config  ethʘ

  • To display all interfaces on the system


  • To change ip address temporarily:

Syn:     #if config ethʘ <ip-address> net mask <sub net mask> <up/down>

#if config ethʘ net mask up

#ifconfig ethʘ             To verify

  • To change permanently:

(a)        #setup             (b)       System-config-network-tui

–> you could also check the output of the interface config file

#vim /etc/sysconfig/network-scripts/ifcfg- ethʘ

Device             = ethʘ


ONBOOT         =Yes

IPADDR            =

NETMASK        =



  • To check the interface detected (or) not:

Syn:     # eth tool <interface>

# eth tool eth ʘ

  • To bring the signle interface down:

#ifdown eth ʘ

  • To restore the interface that you just brought down:

#ifup eth ʘ


  • Any time you make a change to an interface’s settings, you need to bring dwon that interface and then bring it back u again.

WARNING:  Restarting the network service interrupts all network connections and any client that is currently connected.

  • Restart the network service as follows:

Syn: # service <service name> <stop/start/restart/status>

# service network restart

  • To check the all services status:

# service – status – all

  • To Manage permanently:

Syn:     #chkconfig      –level <run levels>     <service name>          <on/off>

#chkconfig      network on

  • To check the status of the service:

# chkconfig –list network

  • To disable the service at boot time:

#chkconfig network off



Routing:   When you have a system that has two or more network interfaces, they are called dual-bomed  (or) multi bomed systems. You need to make sure that each interface has a gateway that  it can route through.

Syn:     route   [options,

Add     Add a net route

Del       Deletes an Existing route

Flush   Flushes any temporary routes

  • Let’s look at the current routes on the system:

# route

  • To set default gateway:

#route add default gw ethʘ

  • To verify:

# route

Learn more about Linux Interview Questions in this blog post. 
Interested in mastering Linux ? Check out this blog post to learn more Linux Training Videos

Networking utilities:

Ping:  Tests the connectivity between two hosts


  • When you ping something on a linux host, unlike in windows, the ping continues until you cancel it. You can limit the number of ping requests sent by prefixing –c number – count in front of the destination host.

#ping –c 3

Net stat: Shows information about connections (open, closed and listening).

  • Using net stat command to obtain information on routing tables, listening sockets, and established connections.

Syn: net stat [options]


-r         Displays the routing table.

-I          Displays interface statistics

-t         shows tcp connections

-U        shows UDP connections

-a         Displays all sockets (tcp, udp, or local)

-p         Displays process Id’s

-e         Displays Extended information.


–> To check that the connection is available for your clients:

# netstat  – tuape  / grep ssh

Client DNS Troubleshooting:

/etc/sysconfig/network : contains the hostname of the system

/etc/hosts  : contains the local IP to hostname mappings

/etc/resolu.cong : contains the IP address of the DNS servers

Nslookup : queries (or) looks up a domain name or system

Ping     : Test connectivity between two hosts.

Ethernet Bonding:

Ethernet bonding is used to combine multiple interfaces into one, creating an increase in available bandwidth and redundancy. This is done by creating a special network interface file called as a channel bonding interface.

For indepth understanding of Linux click on

“At TekSlate, we are trying to create high quality tutorials and articles, if you think any information is incorrect or want to add anything to the article, please feel free to get in touch with us at, we will update the article in 24 hours.”

0 Responses on Networking"

Leave a Message

Your email address will not be published. Required fields are marked *


Please Enter Your Details and Query.
Three + 6