The author is fortunate to have other access points in neighboring houses available as well. Ross, Addison-Wesley/Pearson, 2012.Ģ of a Linksys g combined access point/router, with two wired PCs and one wireless host PC attached to the access point/router. This trace was collected using AirPcap and Wireshark running on a computer in the home network of one of the authors, consisting 1 References to figures and sections are for the 6 th edition of our text, Computer Networks, A Top-down Approach, 6 th ed., J.F. Getting Started Download the zip file and extract the file Wireshark_802_11.pcap. Additionally, if you re really into frame capture, you can buy a small USB device, AirPcap, that captures frames and provides integrated support for Wireshark. If you re able to capture frames using your version of Wireshark, you re welcome to do so. Thus, in this lab, we ll provide a trace of captured frames for you to analyze and assume in the questions below that you are using this trace. Unfortunately, many device drivers for wireless NICs don t provide the hooks to capture/copy received frames for use in Wireshark (see Figure 1 in Lab 1 for an overview of packet capture). Here, since is a wireless link-layer protocol, we ll be capturing frames in the air. In all of the Wireshark labs thus far, we ve captured frames on a wired Ethernet connection. Since we ll be delving a bit deeper into than is covered in the text, you might want to check out A Technical Tutorial on the Protocol, by Pablo Brenner (Breezecom Communications), and Understanding Frame Types, by Jim Geier, And, of course, there is the bible of the standard itself, ANSI/IEEE Std, 1999 Edition (R2003), In particular, you may find Table 1 on page 36 of the standard particularly useful when looking through the wireless trace. Before beginning this lab, you might want to re-read Section 6.3 in the text 1. Ross, All Rights Reserved In this lab, we ll investigate the wireless network protocol.
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1 Wireshark Lab: v6.0 Supplement to Computer Networking: A Top-Down Approach, 6 th ed., J.F.