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src for example is defined as ip_src. ip_src is defined as [12, b] in the included tcpip.def.<br />
tcpip.def can be found in $FWDIR/lib and is a very good resource for <strong>use</strong>ful definitions. You can<br />
include other files in $FWDIR/lib as well if you like.<br />
If you <strong>use</strong> <strong>fw</strong> moni<strong>to</strong>r you can create your own “library” and include it (e.g. using the –f option). This<br />
allows you <strong>to</strong> define your own definitions of commands and expressions you are using on a regular basis.<br />
Take a look at Useful macros in tcpip.def for a collection of <strong>use</strong>ful expressions.<br />
! Please note that predefined macros (like src, dport, sport …) are only au<strong>to</strong>matically defined if<br />
you are using expressions on the command line. If you are using files or standard input for providing<br />
filter expressions you have <strong>to</strong> define the macros for yourself or include them using the #include<br />
directive manually.<br />
<strong>How</strong> <strong>to</strong> <strong>use</strong> <strong>fw</strong> moni<strong>to</strong>r Page 37 of 70<br />
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