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Our experience has shown that WEP has a very high success rate under Ubuntu However, sometimes 128-bit WEP won t work on some troublesome wi-fi devices, and you might need to switch your network to 64-bit WEP instead WEP is a compromise in security terms, but try to remain realistic when considering your immediate environment If your wireless network is within your home, is it likely that the couple living next door will have the know-how to crack a wireless network connection Are they likely to want to do so On the other hand, if you live in an apartment block with several other computer-literate people, or if you work in an office, the risk might be considerably higher Some people suggest that breaking into wireless networks is almost a sport for certain individuals.

The netstat command is a useful tool, but it works only on the host where you run it. Sometimes, when you cannot connect to a given service on a given host, you d like to know if the service is available at all. You can do this with the nmap command. (Use apt-get install nmap to install it.) Like most powerful network tools, nmap also works best if you are root. The nmap command is an expert tool that helps you find out exactly what s happening at another host. If you use it properly, the owner of that host will never even know that you were there. However, you should be aware that running a so-called port scan to monitor open ports on a given host is considered an intrusion by many administrators, so be careful what you re doing with it because you may run into trouble if you use nmap on a host that isn t yours and you haven t notified its owner. If you really want to keep things simple, just use nmap without arguments. For example, nmap 192.168.1.69 performs a basic scan on host 192.168.1.69 to find what common ports are open on it. This gives good results for day-to-day use; see Listing 8-15 for an example. Listing 8-15. The nmap Command Shows You What Services Are Offered by a Host. root@ZNA:~# nmap 192.168.1.69 Starting Nmap 4.20 ( http://insecure.org ) at 2007-08-01 11:08 EDT Interesting ports on 192.168.1.69: Not shown: 1693 closed ports

If this is the case, and you feel you simply can t use WEP, consider installing Windows drivers using NdisWrapper, as explained later in this chapter But whatever the case, bear in mind that confidential Internet connections, such as those for banking and shopping sites, are independently protected using a separate technology See the sidebar titled Secure Connections on the Net later in this chapter for details..

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NdisWrapper is effectively an open source driver (technically described as a kernel module) that allows Linux to use standard Windows XP drivers for wireless network devices. You might describe NdisWrapper as being a translation layer between the Linux kernel and the Windows drivers, which can be installed by using NdisWrapper s configuration tools. You should use NdisWrapper in only one of two situations: Your wireless network hardware simply isn t recognized by Ubuntu: All you see when you click the NetworkManager icon is a Manual Configuration option; you don t see any wireless networks listed. Of course, you should first ensure

PORT STATE SERVICE 22/tcp open ssh 111/tcp open rpcbind 139/tcp open netbios-ssn 445/tcp open microsoft-ds MAC Address: 00:18:8B:AC:C9:54 (Dell) Nmap finished: 1 IP address (1 host up) scanned in 0626 seconds A very common reason why the test shown in Listing 8-15 could fail is that nmap normally tries to ping its targets first On many hosts, ping commands are administratively prohibited, dropped, or ignored And these hosts won t reveal anything when you issue nmap on them To make sure that they re working even when you cannot ping, use the -P0 option to disable ping Another useful option is -O, which tries to guess the operating system that is on the target host And, if you want to make sure that both TCP and UDP ports are scanned, you should include -sT and -sU as well.