Wireshark_NAT_Jan_8_2010_solutions - Wireshark Lab: NAT...

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Wireshark Lab: NAT (WITH SOLUTIONS, IN RED) Version: 1.0 © 2010 J.F. Kurose, K.W. Ross. All Rights Reserved Computer Networking: A Top- down Approach, 5 th edition. In this lab, we’ll investigate the behavior of the NAT protocol. This lab will be different from our other Wireshark labs, where we’ve captured a trace file at a single Wireshark measurement point. Because we’re interested in capturing packets at both the input and output wides of the NAT device, we’ll need to capture packets at two locations. Also, because many students don’t have easy access to a NAT device or to two computers on which to take Wireshark measurements, this isn’t a lab that is easily done “live” by a student. Therefore in this lab, you will use Wireshark trace files that we’ve captured for you. Before beginning this lab, you’ll probably want to review the material on NAT section 4.4 in the text. 1 1. NAT Measurement Scenario In this lab, we’ll capture packets from a simple web request from a client PC in a home network to a www.google.com server. Within the home network, the home network router provides a NAT service, as discussed in Chapter 4. Figure 1 shows our Wireshark trace-collection scenario. As in our other Wireshark labs, we collect a Wireshark trace on the client PC in our home network. This file is called NAT_home_side 2 . Because we are also interested in the packets being sent by the NAT router into the ISP, we’ll collect a second trace file at a PC (not shown) tapping into the 1 All references to the text in this lab are to Computer Networking: A Top-down Approach, 5 th edition. 2 Download the zip file http://gaia.cs.umass.edu/wireshark-labs/wireshark-traces.zip and extract the files need for this lab. NAT router home network ISP network trace file: NAT_home_side trace file: NAT_ISP_side Figure 1 : NAT trace collection scenario
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link from the home router into the ISP network, as shown in Figure 1. (The hub device shown on the ISP side of the router is used to tap into the link between the NAT router and the first hop router in the ISP). Client-to-server packets captured by Wireshark at this point will have undergone NAT translation. The Wireshark trace file captured on the
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This note was uploaded on 08/30/2011 for the course ECE 3076 taught by Professor Copeland during the Spring '08 term at Georgia Tech.

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Wireshark_NAT_Jan_8_2010_solutions - Wireshark Lab: NAT...

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