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Lab Nat 4 Applied Networking

In: Computers and Technology

Submitted By cloudfenrir92
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Lab 4
NAT
Joel Garcia
Cgs 4285

Contents Objective: 3 Procedures: 3 Experience: 3 Conclusion: 4 Data Table Error! Bookmark not defined. Questions 5

Objective:

The objective of this lab is to configure DNS client settings, for Linux and Windows Stations, to observe DNS in action, and to observe NAT in action.
Procedures:

1. First, verify that workstation 1 and workstation 2 have the correct IP addresses and default route.

2. Configure DNS servers for workstation 1 and workstation 2. After, configure workstation 2 to use 131.94.131.43 as a DNS resolver by entering the command: echo “nameserver 131.94.133.43” > /etc/resolv.conf. Afterwards, configure workstation 1by going to TCP/IP Properties and adding 131.94.133.43 as the DNS server.

3. Next, find the public IP address of the eth0 interface on the monitor workstation by using the ifconfig command. As a root on the monitor, input: tcpdump -i eth0 -n -s 0 -w /tmp/public.pcap host PUBLICIPADDRESS & tcpdump -i eth1 -n -s 0 -w /tmp/private-net1.pcap & tcpdump -i eth2 -n -s 0 -w /tmp/private-net2.pcap & 4. Then, connect to port 7 and source port 2000 on workstation 1 with the command: nc -p 2000 cgs4285.cs.fiu.edu 7
Type in three or four lines of random data and repeat the same process for workstation 2. Enter “ctrl+c” afterwards to stop the process on workstation 1 and 2.

5. On the monitor station, enter this command to stop the ‘tcpdump’ process: kill %1 %2 %3 6. Now remove the default route on the mon box and add a special route to copy off the data. route del -net default route add -net 131.94.0.0/16 gw 131.94.128.2

kill %1 %2

7. Lastly, copy off the two 'pcap' files to the JCCL linux account on ocelot.cs.fiu.edu. Use wireshark to analyze these offline. On...

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