CSCI 57 and 65: Introduction to Unix Courses

Laboratory Assignment 10

ASSIGNMENT DUE: see calendar on the web

1. TURN-IN a hard copy of the following:

On all homework please include

Your Name
Course Number
Date
ecst login name

The preferred format for homework for the rest of the semester (unless otherwise specified) is to just print it out the lab webpage and write your answers on the printout.

If you are really into typing I will still take it typed.

You do NOT need to include the printing cover page (details given in lab).
You do NOT need to print from Unix.

Do this lab on tiglon (otherwise you will get wrong answers)
Please answer the following questions (answers and/or help given in lab).

Things to do on tiglon (ect-unix.ecst.csuchico.edu)

hostname

The hostname command will tell you the name of the host you are one.
What host are you on (it better be tiglon)? _____________________________________
Make sure you do all of this assignment on tiglon.

ping

ping sends a small packet to a server which the server then sends back.
ping lets you test things like if a host is alive.
Typing ping www.google.com should respond with a message like "www.google.com is alive"
Now try typing ping -s www.google.com (Type <Ctrl>-c to exit).

The "-s" option gives you statistics.
How many milliseconds does it take to ping www.google.com from tiglon?

min________________________
max________________________
average_____________________

How many packets were transmitted?______________________________
How many packets were recieved?_________________________________
(After typing <Ctrl>-c you will see ping statistics)

Now try ping -s 132.241.82.24

How many milliseconds does it take to ping 132.241.82.24 from tiglon?

min________________________
max________________________
average_____________________
What is the human readable host name of 132.241.82.24?__________________________________________

nslookup (on Linux nslookup is being replaced in favor of similar commands such as host and dig, tiglon doesn't have these commands though).

nslookup is for looking up hostnames corresponding to ip addresses and vice versa

There are two parts to the output

The nameserver that responded, hostname and ip
The hostname and ip address(es) of the host you wanted to lookup

Try nslookup www.hotmail.com

What is the name of the server that answered you?_________________________________________________
What are the IP addresses of www.hotmail.com?___________________________________________________
___________________________________________________________________________________________

Try nslookup www.csuchico.edu

What is the name of the server?____________________________________________________
What is the ip address?___________________________________________________________
What is the alias name?___________________________________________________________

What is the IP address of steriod (steriod is one of the schools Unix servers in case you didn't know)?

______________________________________________________________________________

Try nslookup 132.241.6.15 to find out the domain name for this address

What is the domain name?________________________________________________________
What is the alias name? __________________________________________________________

ifconfig

ifconfig is for configuring and finding out information about network interfaces.
Type ifconfig -a to see information about all of tiglon's network interfaces

Tiglon's ethernet card is called hme0 (on Linux this would be called eth0)

What is the IP address of hme0?____________________________________
What is the netmask?_____________________________________________
What is the broadcast address?______________________________________

The loopback interface has the IP address 127.0.0.1

What is loopback interface name (like hme0 except something else)?_______________________

traceroute

traceroute displays the route between your computer and another
Try traceroute www.whitehouse.gov

How many computers/routers are between tiglon and www.whitehouse.gov?______________________

Try traceroute www.shocking.com

How many computers/routers are between tiglon and www.shocking.com?________________________

Try traceroute www.csuchico.edu

How many computers/routers are between tiglon and www.csuchico.edu?________________________

Try traceroute www.sunset.net

How many computers/routers are between tiglon and www.sunset.net?___________________________

whois

whois lets you query the whois database to find out who different domains are registered to.
Try whois google.com

This gave me three results (you will have to scroll up to find these results)

GOOGLE.COM.SUCKS.FIND.CRACKZ.WITH.SEARCH.GULLI.COM
GOOGLE.COM.HAS.LESS.FREE.PORN.IN.ITS.SEARCH.ENGINE.THAN.SECZY.COM
GOOGLE.COM

(One result is actually google and the others are some other funky domains, ignore them).

To find out information about google.com type whois =google.com (look near the top of the output)

Who is the registrar for google.com?_______________________________________________
What is the name server(s) for google.com?_________________________________________
_____________________________________________________________________________
When was the creation date for google.com?_________________________________________
What is the expiration date for google.com?_________________________________________

Try whois csuchico.edu

Who is the registrar for csuchico.edu?___________________________________________________
When was the creation date for csuchico.edu?_____________________________________________
When was it last updated?_____________________________________________________________

/etc/services

This file contains a list of network services and which port they are on
The format of this file is "service-name port-number/protocol aliases"
Look at this file to find what port the following services listen on

ftp?__________________________
telnet?________________________
smtp?_________________________
finger?________________________

finger

finger lets you find out information about a user on a particular host.
finger requires a finger service to be running on the target machine to provide information.

This service isn't used very much any more.
(any service is a potential security hole so people don't run things they don't need).

Try finger lisonbee@freeshell.org

On my freeshell acount

Give the full path to my default shell ( /usr/something/something/bash )?__________________________________________
What is the secret phrase in my .plan file?_____________________________________________

who

who tells you who is on the system
run who on tiglon to see who is on the system

What is in the column to the furthest right?_________________________________________________

w is a command similar to who except w also tells you what command a user is running
What information does the third column provide?_________________________________________________
What information does the right most column provide?____________________________________________

ftp

I am sure everyone is familar with ftp, most people don't know how to use it at the command line though.
Type ftp to begin

This will give you a prompt like ftp>
Type help to see a list of available commands.
Type open ftp.kernel.org to connect to a server.
Login with username "anonymous" and use your email address as a password ( "me@email.com" ).
Use ls to list files
Change to the pub directory ( type "cd pub" ).
Type ls to list the files.
Download the README file ( type "get README" ).
Now type quit to exit
You have downloaded the README file, read it and find an email address for "comments on this site"

What is the email address?___________________________________________________________

Start ftp again, type ftp

Type help to see a list of available commands, find out about a specific commnand by typing help <command name>

What is put for?_______________________________________________________________
What is mget for?______________________________________________________________
What is lcd for?________________________________________________________________
What is pwd for?_______________________________________________________________
What is ascii for?_______________________________________________________________
What is binary for?_____________________________________________________________

Note that commands are similar for sftp (secure ftp).

lynx

lynx is a text only browser that you can run inside a terminal
Text only browsers can be useful when you don't have X, otherwise they pretty much suck.
Run lynx by typing lynx

This will bring you the homepage for lynx
Go to google by typing "g" and then "http://www.google.com"
After being prompted if you want to accept cookies you should see google's homepage ( a little different than normal).
Use the up and down arrows to switch between links and the "right arrow" or "enter" to follow a link.

What key do you type in lynx for

help?_________________________________________________________
options?______________________________________________________

/etc/resolv.conf

resolv.conf contains a list of name servers for to consult for name resolution
View /etc/resolv.conf

How many name servers are listed?________________________________________________________
What is the IP address of the first name server listed?__________________________________________

/etc/hosts

This file contains static host information. There is always at least one entry in this file.
There are three name servers listed here on tiglon, what are their names? (hint: under DNS/NIS)

_____________________________________________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________

What is the address for localhost?______________________________________________________________

/etc/nsswitch.conf

Gives the order of consultation for when doing lookups
View this file and find the "hosts" entry.

An entry such as "hosts: dns files" means the system will try a DNS server and then /etc/hosts to find an IP address
An entry such as "hosts: files dns" means the system will try /etc/hosts and then DNS to find an IP address
Which order is it on tiglon?______________________________________________________________