Networking Review, Unix Commands Lab

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X. The "ifconfig" command

% ifconfig eth0

	What is the MAC address:_______________________
	What is the IP address:________________________
	What is the Netmask:___________________________
	What is the Broadcast address:_________________
	What is the Link State:________________________

% sudo ifdown eth0

	What is the Link State?:________________________

% sudo ifup eth0

	What is the Link State?:________________________

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X. The "netstat" command

% netstat -i

	Which interfaces show RX-OK TX-OK counts?:____________________

% netstat -s

	What kind of information do you see?:_________________________

% netstat -paulnt

	What program services are listening?:_________________________

% netstat -pault

	What did the "-n" option do?:_________________________________

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X. The "arp" and "ip neighbor" commands

% arp -a

	How many arp entries are there?:____________________________

% ip neighbor show

	Arp entries, anything different?:___________________________

% sudo ip neighbor flush all && ip neighbor show

	How many arp entries are there now?:________________________

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X. The "arping" command

	Pick an address of another machine at your table .
	
% sudo arping -c 3 X.X.X.X

	What does your arp cache show now?:__________________________

	What do you see in the "reply" message show?:________________

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X. The "ping" command

	Pick an address of another machine at your table .

% ping -c 10 X.X.X.X

% ping -c 1000 -i 0.001 X.X.X.X

% ping -q -c 1000 -i 0.001 -s 1460 X.X.X.X

	What does the "-c" option control?_____________________________
	What does the "-i" option control?_____________________________
	What does the "-s" option control?_____________________________

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X. The "traceroute" and "mtr" commands

% sudo apt-get install traceroute
% traceroute -n www.grc.com
% traceroute www.grc.com
% traceroute -n www.microsoft.com
	
	What are the units of measurement?____________________________

	What does a "*" mean in the output?___________________________

% sudo apt-get install mtr
( this will replace "mtr-tiny", and give you an X-Windows version )

	Try pinging your neighbor X.X.X.X

% mtr

	Type in 0.01 where the default "1" shows.
	What did that change?_________________________________________

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X. The "tcptraceroute" command

% tcptraceroute www.grc.com

	What TCP port is used by default?_____________________________

% tcptraceroute -n ns.uoregon.edu 22

	What TCP Service is being checked?_____________________________