Networking commands in Linux Assignment

Execute the following commands and write their output

1. ping:

This command is used to test connectivity between two nodes. Ping use ICMP (Internet ControlMessageProtocol)tocommunicatetootherdevices.Youcanpinghostnameoripaddressusingbelowcommand.

example:ping201.54.100.1orpingwww.google.com

2.hostname

Gives the host name of the computer they are logged into. To set the hostname permanentlyuse/etc/sysconfig/network file.

3.traceroute

traceroute isanetworktroubleshootingutilitythatshows the numberofhopstakentoreach the destination and alsodetermines the packettravelingpath.

4.netstat

Netstat (Network Statistic) command displays interfaces,connection information, routingtable informationetc.

Executeitwiththefollowingoptions andwritetheoutput:

netstat tnetstat s tnetstat -i

5.ifconfig

ifconfigisusedfordisplayingnetworkinterfaceinformation.

6.who

Displaysinformationofalluserswhoareloggedin

7.whoami

The whoami command writes the user name (i.e., login name) of the owner of the currentloginsession to standardoutput.

8.nmap

Networkmappertooltodiscoverhostsandservicesona computernetwork.

9.tcpdump

Tcpdumpprintsoutadescriptionofthecontentsofpacketsonanetworkinterface thatmatch the boolean expression; the description is preceded by a time stamp, printed, bydefault, ashours,minutes,seconds,and fractionsofa secondsincemidnight.

SampleoutputforARPprotocol:

arpwho-has128.3.254.6tell128.3.254.68

arpreply128.3.254.6is-at02:07:01:00:01:c4