====== Network Configuration: Results ====== ^EG-253^Practical Internet Technology II ^ |**Name** |Selcuk Gorgulu | |**Student Number** |620417 | |**Date of Submission** |18th November 2010 | ===== 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**: europa ==== Question 3 ==== Which configuration file would you need to edit to change your computer's name on the network? Your answer (//one of//): /etc/hostname ==== 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 | 192.168.2.3 | | 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 | 192.168.2.255 | | 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.)) | 00:16:76:90:38:96 | | The frame-level (layer 1) protocol is used to send network messages to the network from my host? | MTU | **Comment**: Frame layer prototcol is Ethernet! MTU is "maximum transmission unit"! ==== 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/interfaces Please include a listing of the file chosen in answer to [[#question_8|Question 8]]: selcuk@europa:~$ cat /etc/network/interfaces auto eth0 iface eth0 inet static address 192.168.2.3 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]]: selcuk@europa:~$ cat /etc/hosts 127.0.0.1 europa localhost.localdomain localhost 127.0.1.1 europa 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 ==== Question 12 ==== What is the symbolic name of your network's gateway interface? **Answer**: jupiter.icct.com jupiter jupiter-if2 ==== Question 13 ==== What is the purpose of the Gateway interface? **Answer**: Gateway interface is standard way for a Web server to pass a Web user's request to an application program and to receive data back to forward to the user. **Nope** I think you are confusing this with C-GI! ==== 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** selcuk@europa:~$ 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 ==== 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**: enable forwarding ==== Question 17 ==== Which run-time command can be used to make a Ubuntu Linux host act as a router? **Answer**: echo 1 > /proc/sys/net/ipv4/ip_forward ==== 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** ip_forward=yes spoofprotect=yes **Comment**: Only first is really needed for this feature. The second line is for additional security. ==== 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**: up route add -net 192.168.3.0 netmask 255.255.255.0 gw 192.168.1.4 down route del -net 192.168.3.0 netmask 255.255.255.0 gw 192.168.1.4 ===== 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''. Displays the kernel routing table in the way we've been doing with route **Answer** 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 0 0 0 eth0 Add your explanation here. ==== Question 21 ==== Give and explain the output of the command ''netstat -i''. netstat -i display the interface table. **Answer** 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 11748 0 0 0 9654 0 0 0 BMRU lo 16436 0 12 0 0 0 12 0 0 0 LRU Add your explanation here. ==== Question 22 ==== Give and explain the output of the command ''netstat -ta''. Displays all active TCP connections and the TCP and UDP ports on the computer **Answer** user@host:~$ netstat -ta Active Internet connections (servers and established) Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 europa:ipp *:* LISTEN tcp 0 0 europa.jupiter.ic:39654 server77-68-39-12.l:www ESTABLISHED tcp 0 0 europa.jupiter.ic:37314 lhr14s02-in-f104.1e:www ESTABLISHED tcp 0 0 europa.jupiter.ic:39653 server77-68-39-12.l:www TIME_WAIT tcp 0 0 europa.jupiter.ic:39659 server77-68-39-12.l:www TIME_WAIT tcp6 0 0 localhost:ipp [::]:* LISTEN Add your explanation here. ===== 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** selcuk@europa:~$ traceroute titan traceroute to titan (192.168.3.4), 30 hops max, 60 byte packets 1 jupiter.icct.com (192.168.2.1) 1.293 ms 1.275 ms 1.263 ms 2 jupiter.icct.com (192.168.2.1) 3010.181 ms !H 3010.180 ms !H 3010.170 ms !H ==== Question 24 ==== Give the output of ''traceroute'' from your host to ''www.swan.ac.uk'' **Answer** selcuk@europa:~$ traceroute www.swan.ac.uk traceroute to www.swan.ac.uk (137.44.1.7), 30 hops max, 60 byte packets 1 jupiter.icct.com (192.168.2.1) 0.885 ms 0.872 ms 0.861 ms 2 * * * 3 * * * 4 * * * 5 * * * 6 * * * 7 * * * 8 * * * 9 * * * 10 * * * 11 * * * 12 * * * 13 * * * 14 * * * 15 * * * 16 * * * 17 * * * 18 * * * 19 * * * 20 * * * 21 * * * 22 * * * 23 * * * 24 * * * 25 * * * 26 * * * 27 * * * 28 * * * 29 * * * 30 * * * The router ignoring the pings. ===== 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** For all of the computer we have to edit the /etc/hosts and add; 192.168.10.1 engineering.swan-icct.ac.uk gw-engineering engineering-if2 If there are some clients in the engineering network we have to define them also. In my example I have one client on engineering network (client.swan-icct.ac.uk with ip 192.168.10.3 so add the client also on etc/hosts file ; 192.168.10.3 client.swan-icct.ac.uk client ==== 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 here by submit this work for marking. SELCUK GORGULU