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applications, such as FTP, require that the PIX understand special properties of the application so that connections that are legitimately part of the application are permitted access During an FTP transfer, for example, the PIX needs to be aware of the second data channel that is opened from the server to the initiating workstation Similarly, the PIX implements a feature called Mail Guard, which allows only the SMTP commands HELO, MAIL, RCPT, DATA, RSET, NOOP, and QUIT access to a protected SMTP server The PIX identifies applications by the TCP or UDP port number contained in the IP packets It identifies FTP by port number 21 and SMTP by port number 25, for example In most cases, there is no reason to change these port numbers, but in rare cases you may have a service listening on a non-standard port number For instance, you might have an FTP server listening on port 5140 In this case, the PIX would not recognize that port 5140 is being used for an FTP transfer and might incorrectly believe that the return FTP data connection from the server should be blocked This problem could be resolved by adding port 5140 to the fixup protocol command as shown below: fixup protocol ftp 5140 This command allows the PIX to recognize that connections to port 5140 should be treated in the same manner as connections to port 21 Another use of the fixup command is to disable the normal handling of certain applications by the PIX If for some reason you wished to allow more SMTP commands than those allowed in the default configuration, you could disable the fixup command for SMTP as shown below: no fixup protocol smtp 25 This disables the Mail Guard feature The default processing of other applications can be disabled similarly The RSH application is somewhat special in that the default value of 514 cannot be changed, but additional RSH values can be added.

figure 10-26

figure 10-27

10:

9600 56,000 1,536,000

FIGURE 6-20

0000 0000 0000 0001

You will notice in Figure 6-20 that to connect to the FTP server you type:

The server will then ask you for a username and password Once you type a valid username and password, you will be logged on and placed at the FTP prompt, where you can type FTP commands to potentially view, upload, and download files

1,025 102 50

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A command-line client utility is included with many versions of Windows and Linux, and many third-party FTP server and client applications are available for connecting to an FTP server and downloading files Some third-party utilities are Windows-based utilities, adding a graphical interface to the download functionality FTP is started by typing ftp at a command prompt followed by the fully qualified domain name or IP address of the target machine As with Telnet, the client computer must be able to resolve the remote computer s name into an IP address for the command to succeed Once logged on, users can browse through directories, download and upload files, and log out There is a wide array of commands available in the FTP utility These commands are used to control the FTP application and its functions Table 6-7 lists some of the more common FTP commands that are available in an FTP session

1/256 1/256 1/128 1/128 1/128 1/32 1/16 1/8 1/8

TABLE 6-7

Changes working directory Deletes file Lists current directory contents Logs out Downloads a file Uploads a file Turns verbose mode on and off

EIA-232 cannot transmit a given speed of data at the same rate as the other interface standards because it uses unbalanced signals The terms balanced and unbalanced are often used in data communications, so we will explain the difference between these two types of communication

To use the FTP utility, perform Exercise 6-7 from LabBookpdf on the CD-ROM or watch the CertCam training video on the CD-ROM

Reserved for NSAP Allocation 0000 001 Reserved for IPX Allocation Unassigned Unassigned Unassigned Unassigned Provider-based Unicast Address Unassigned Reserved for Geographicbased Unassigned Unassigned Unassigned Unassigned Unassigned Unassigned Unassigned Link-Local Use Addresses 0000 010 0000 011 0000 1 0001 001 010

Users require a login ID to access FTP services if anonymous access is disabled Most systems today enable an anonymous login, but these users should not possess full rights to the system Common problems with connecting via FTP are an invalid login or insufficient access rights If you are having problems connecting to an FTP server, contact your FTP server administrator to verify that your login ID is set up correctly

Several switches are available for the command-line FTP utility These options enable you to further customize the use of FTP to meet your needs The -v option suppresses the display of remote server responses This provides a more user-friendly interface to the utility By default, when you start FTP, it attempts to log on automatically You can disable this function by using the -n option The -I option turns off the interactive prompting that occurs during multiple transfers, which makes for a more automated approach to FTP The -d option enables you to turn on the debugging functions This feature displays all FTP commands that are passed between the client and server

.

6:

011 100

Another option included with the FTP command-line utility is the capability to run a script of commands after the program is started The script file is used instead of redirection and can include any standard command You must append the -s: switch followed by the path and filename of the script One of my favorite switches for FTP is -a, which will automatically log on as the anonymous account; this saves you the hassle of having to type the anonymous account name for a logon Table 6-8 lists the FTP command-line switches

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