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====== Network Configuration: Results ======

^EG-253^Practical Internet Technology II ^
|**Name** |Yu-Ting Lu and Christopher Hancock |
|**Student Number** |461467 and 486274 |
|**Date of Submission** |29th Jan 2009 |   

===== Instructions =====

This wiki page allows you to record the results of your network configuration exercise. You may need to refer to the configuration handout to complete this document. 

**Answer** all questions based on the host that you are configuring in the lab. Edit this wiki page directly to insert your answers. You will probably find this most convenient to do at the same time as you perform the configuration. Where requested, please include listings of the actual configuration files and command outputs directly in the document. Placeholders have been provided for this purpose. Please follow the formatting hints given in the text.

When the exercise is complete you should [[#signature|sign]] and submit it in for marking. Deadline for completion is the start of the lab on the last week of this term. 

This exercise is worth 20% of the module marks. 

===== Host Configuration =====


==== Question 1 ====
 

Which Linux command gives you information about your computer's name on the network?

**Answer** (//delete as appropriate//):

  hostname 


==== Question 2 ====

Use the command selected in [[#question_1|Question 1]] to determine your host computer's name? What is the name?

**Answer**: 
ganymede



==== Question 3 ====

Which configuration file would you need to edit to change your computer's name on the network?

Your answer (//one of//):

  /etc/hosts


==== Question 4 ====

Which linux command gives you information on your host's network settings?

**Answer** //one of//:

  ifconfig 

==== Question 5 ====

Use the command selected in [[#question_4|Question 4]] to complete the following table:
^ Feature ^ Value ^
| My host's IP address | 192.168.2.4 |
| My network's IP address | 192.168.2.0 |
| The address used by my host to send an IP packet to all hosts on my network | 192.168.2.1 |
| The netmask of my host | 255.255.255.0 |
| The hardware address (MAC Address) of my LAN-facing network interface connection (NIC)((If your host has two or more network cards, the LAN-facing card will be the NIC assigned to your host's static IP address.)) | 00:10:5a:13:6f:ea | 
| The frame-level (layer 1) protocol is used to send network messages to the network from my host? | Ethernet |  



==== Question 6 ====

How many hosts can the sub-net defined by your host's netmask support?

**Answer** //one of//:

  254 



==== Question 7 ====

What class of network is the //sub-net// to which your host has been assigned?

**Answer** //one of//:

  Class C 


===== Network Configuration =====

**Answer** the following questions about your network configuration. Please copy and paste the contents of the files identified in [[#question_8|Questions 8]] and [[#question_11|11]] to your submission.



==== Question 8 ====
 

In which file is the configuration of your Network Interface Controller (NIC) configured?

**Answer** //one of//:

  /etc/network/options

Please include a listing of the file chosen in answer to [[#question_8|Question 8]]:
  
  # added to fix "can't ping localhost" problem
  iface lo inet loopback
  auto lo
  auto eth0
  iface eth0 inet static
  address 192.168.2.4
  network 192.168.2.0
  netmask 255.255.255.0
  gateway 192.168.2.1




==== Question 9 ====

What is the IP address of the host which serves as the default gateway for your network?

**Answer**: 192.168.2.1


==== Question 10 ====

What is the hostname of the gateway interface?

**Answer**: jupiter


==== Question 11 ====

In which file is the symbolic names of the networks, hosts and interfaces available on the network defined?

**Answer** //one of//:

  /etc/hosts

Please include a listing of the file chosen in answer to [[#question_11|Question 11]]:

	127.0.0.1       localhost
	127.0.1.1       ganymede
	
	#  /etc/hosts -- Hosts file for ICCT Private network
	#
	#  IP           FQDN                            aliases
	#
	127.0.0.1       localhost.localdomain           localhost myhost
	#
	192.168.1.1     solaris.icct.com                solaris inet-gateway
	192.168.1.2     venus.icct.com                  venus www
	#
	# Jupiter cluster
	#
	192.168.1.3     gw-jupiter.icct.com             gw-planets jupiter-if1
	192.168.2.1     jupiter.icct.com                jupiter jupiter-if2
	192.168.2.2     callisto.jupiter.icct.com       callisto
	192.168.2.3     europa.jupiter.icct.com         europa
	192.168.2.4     ganymede.jupiter.icct.com       ganymede
	#
	# Saturn cluster
	#
	192.168.1.4     gw-saturn.icct.com              gw-saturn saturn-if1
	192.168.3.1     saturn.icct.com                 saturn saturn-if2
	192.168.3.2     dione.saturn.icct.com           dione
	192.168.3.3     tethys.saturn.icct.com          tethys
	192.168.3.4     titan.saturn.icct.com           titan
	#
	# Add other hosts/clusters below here
	# (We'll use this to add virtual hosts to the web-server in a later
	# lab exercise)
	
	## The following lines are desirable for IPv6 capable hosts
	::1     ip6-localhost ip6-loopback
	fe00::0 ip6-localnet
	ff00::0 ip6-mcastprefix
	ff02::1 ip6-allnodes
	ff02::2 ip6-allrouters
	ff02::3 ip6-allhosts
	



 

==== Question 12 ====

What is the symbolic name of your network's gateway interface?

**Answer**: gw-jupiter.icct.com

==== Question 13 ====

What is the purpose of the Gateway interface?

**Answer**: 
To allow icct-net, jupiter-net and saturn-net subnets to reach each other.  The gateway act as a join at each point.  Also used to gain access to internet.  

==== Question 14 ====

Which linux command shows the routing table for your host?

**Answer**: route
Run the command identified in [[#question_14|Question 14]] and reproduce its output here.


**Answer**

<cli prompt="$" comment="#">
user@host:~$ route # 
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
jupiter-net     *               255.255.255.0   U     0      0        0 eth0
link-local      *               255.255.0.0     U     1000   0        0 eth0
default         jupiter.icct.co 0.0.0.0         UG    100    0        0 eth0
</cli>

==== Question 15 ====

How many interfaces (NICs) must a router have?

**Answer** //one of//:

  2 

==== Question 16 ====

Which system feature must be turned on if you want a Linux host to act as a router?

**Answer**: ip forward

==== Question 17 ====

Which run-time command can be used to make a Ubuntu Linux host act as a router?

**Answer**: set ip_forward=yes 

==== Question 18 ====

In which file is the setting defined in [[#question17|Question 17]] set if you want a Ubuntu host to be configured as a router at boot-time?

**Answer**: /etc/network/options


Reproduce the contents of the file defined in [[#question_17|Question 17]] to make a Ubuntu host into a router?

**Answer**

  Copy contents of file and paste it as a listing here. 
  Include a minumum indent of two spaces per line.
  Like this. 
  # /etc/network/options - for ICCT network
  # set ip_forward=yes if you need to set
  # up a machine with two network interface cards
  # as a router
  ip_forward=no
  spoofprotect=yes
  syncookies=no

  

==== Question 19 ====

What setting has been added to the network configuration file to define a route to ''icct-net'' from your sub-network's cluster-server?

**Answer**: 

  Copy contents of file and paste it as a listing here. 
  Include a minumum indent of two spaces per line.
  Like this. 


===== Checking Your Network =====

The Linux command ''netstat'' gives a lot of useful information on your network. In the following 3 questions, reproduce the output of various usages of netstat. You should annotate your results with a brief explanation of what they mean. You may need to print the output and attach to the submission.

==== Question 20 ====

Give and explain the output of the command ''netstat -r''. 

**Answer**
<cli prompt="$" comment="#">
  user@host:~$ netstat -r
  Kernel IP routing table
  Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
  jupiter-net     *               255.255.255.0   U         0 0          0 eth0
  link-local      *               255.255.0.0     U         0 0          0 eth0
  default         jupiter.icct.co 0.0.0.0         UG     
</cli>

Add your explanation here.
Netstat shows Kernel routing tables as shown above.


==== Question 21 ====

Give and explain the output of the command ''netstat -i''. 


**Answer**
<cli prompt="$" comment="#">
user@host:~$ netstat -i
  Kernel Interface table
  Iface   MTU Met   RX-OK RX-ERR RX-DRP RX-OVR    TX-OK TX-ERR TX-DRP TX-OVR Flg
  eth0       1500 0      2522      0      0 3          2132      0      0      0 BMRU
  lo        16436 0      6728      0      0 0          6728      0      0      0 LRU

</cli>

Add your explanation here.
Is used to show network interfaces.

==== Question 22 ====

Give and explain the output of the command ''netstat -ta''. 

**Answer**
<cli prompt="$" comment="#">
user@host:~$ netstat -ta
  Active Internet connections (servers and established)
  Proto Recv-Q Send-Q Local Address           Foreign Address         State      
  tcp        0      0 localhost:ipp           *:*                     LISTEN     
  tcp        0      0 ganymede.jupiter.:55806 blackboard.swan.ac.:www ESTABLISHED
  tcp        0      0 ganymede.jupiter.:55805 blackboard.swan.ac.:www ESTABLISHED

</cli>

Add your explanation here.
Show TCP sockets that are waiting for connection.  

===== Testing the Connectivity of your network =====

Install, if necessary, the //traceroute// command then answer the following two questions.

==== Question 23 ====

Give the output of traceroute from your host to any host on one of the other ICCT networks.

**Answer**
<cli prompt="$" comment="#">
user@host:~$ command
  traceroute to europa (192.168.2.3), 30 hops max, 40 byte packets
  1  europa.jupiter.icct.com (192.168.2.3)  2.560 ms  2.566 ms  2.553 ms
</cli>  




==== Question 24 ====

Give the output of ''traceroute'' from your host to ''www.swan.ac.uk''

**Answer**
<cli prompt="$" comment="#">
user@host:~$ command
  traceroute to www.swan.ac.uk (137.44.1.7), 30 hops max, 40 byte packets
  1  jupiter.icct.com (192.168.2.1)  0.210 ms  0.211 ms  0.210 ms
</cli>  

Explain the result.
shows the time it took to send and recieve packets
===== Extension Questions =====


==== Question 25 ====

A new sub-network engineering-net (''192.168.10.0/24'') is to be added to the ICCT network. Host engineering (''192.168.10.1/32'') is a cluster server for this new network. Give the settings needed to set up this host as a router to ''icct-net'', ''jupiter-net'', and ''saturn-net'' and a gateway for ''engineering-net''.

**Answer**

==== Question 26 ====

Which other files would you need to modify to correctly set up this new router?

**Answer** 


==== Question 27 ====

Summarize the changes that you would you need to make to your host's network configuration to have the new //engineering// sub-network recognized?

**Answer** 


==== Question 27 ====

Which other files would you need to modify to fully configure your host to recognizes the new engineering sub-network?

**Answer**


===== Signature =====


I hereby submit this work for marking.

Your signature here: