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16:00:21.045220 IP RNA.lan.ssh > ida.lan.9603: P 2706188:2706320(132) ack 12377 win\ 13936 16:00:21.045267 IP ida.lan.9603 > RNA.lan.ssh: . ack 2705976 win 65535 16:00:21.045336 IP RNA.lan.ssh > ida.lan.9603: P 2706320:2706452(132) ack 12377 win\ 13936 ... 23826 packets captured 24116 packets received by filter 288 packets dropped by kernel Wireshark is built on top of tcpdump and can be used to view network packets from a graphical interface. This allows you to see what protocols are used, who is sending the packets, and even what is inside them. Before starting with these tools, however, you should know one thing: you can monitor only what you can see. If you re on a shared network in which every node sees every packet coming by, it s easy to monitor everything sent by all hosts on the network. But this isn t the case on modern switched networks. If your computer is connected to a switch, you can see only those packets that are addressed to the host from where you run the monitoring software. To see the packets sent by others, you need a specialized tool, like the ARP poisoning tool Ettercap. (This is a very dangerous tool that can severely disturb network communications, and I won t be covering it in this book.) Another way of seeing all packets that are sent on the network is to connect the computer on which you re capturing packets to your switch s management port. This allows you to see all the packets sent on the network.

different tournaments, and Listing 8-29 shows the more general statement that replaces 5 with an expression to find the number of distinct tournaments directly.

To identify the wireless network hardware for use with NdisWrapper, you need two pieces of information: the make and model of the hardware and the PCI ID number The former is the make and model of the hardware as identified by Ubuntu as a result of system probing, rather than what s quoted on the packaging for the wireless network device or in its documentation These details discovered by Ubuntu will usually relate to the manufacturer of the underlying components, rather than the company that assembled and marketed the computer The PCI ID is two four-digit hexadecimal numbers used by your computer to identify the device internally (such as 168c:001c) The same PCI ID numbering system is used by both Windows and Ubuntu, which is why it s so useful in this instance You can find both the PCI ID and the make/model information by using the Device Manager tool.

Follow the instructions in the Installing Device Manager section earlier in this chapter if you haven t already installed this program Then follow these steps: 1 Choose Applications System Tools Device Manager In the left column, find the entry that reads Network Controller, Networking Wireless Control Interface, or WLAN Interface You might also look for USB Interface, PCI Bridge, or 80211 to exhaust your search Then look at the corresponding summary in the right column, where you ll find the make and model of the hardware listed under the Vendor and Model headings If no useful details are listed, you might need to click the parent entry in the list On one test system, we found the WLAN Interface entry, but saw the make and model details only after we clicked the Ethernet Controller parent entry in the list on the left.

Because tcpdump is a very straightforward tool; it does exactly what its name promises: dumps TCP packets on the console of your machine so you can see all packets received by the network board of your server. By default, it shows the first 96 bytes of every packet, but, if you need more details, you can start it with the -v or even with the -vv option so that it will be more verbose. On a very busy server, tcpdump isn t very useful. The information passes by way too fast to see what s happening, and so it makes sense to pipe its output to a file and grep that file for the information that you really need. Although tcpdump is an excellent tool for capturing packets, it isn t the best solution if you want to do something with the captured packets afterward. That would be Wireshark.

Write down the make and model shown in Device Manager For example, on a test notebook containing an Atheros wireless network device, the make and model read AR5001 Wireless Network Adapter Remember that these details don t relate to those listed in the instruction manual or computer packaging (our notebook s specification lists the hardware simply as Built-in AirPort.

Listing 8-28. Find Members Who Have Entered Five Different Tournaments SELECT MemberID FROM Entry e GROUP BY MemberID HAVING COUNT(DISTINCT TourID) = 5 Listing 8-29. Find Members Who Have Entered All the Different Tournaments in the