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Appendix B
BPre-Defined Filter Templates
Filter Templates
All filter templates supplied with Surveyor are described below. Templates are
defined by an offset(s) and a value(s). These templates can be used in a capture or
display filter to capture or display common protocol packets.
An OR in the Offset column indicates that the associated value will cause the frame
to be captured/displayed if the value is found in either offset. An OR in the Value
column indicates that any of the ORed values found in the associated offset will
cause the frame to be captured/displayed. HEX indicates hexadecimal format and
DEC indicates decimal format in the Value column.
Filter values are interpreted on byte boundaries. Therefore, port numbers expressed
in decimal are shown in the table in “dot” notation. For example, port 1719
(H.323_GD) is shown as “6.183” in decimal; the “6” displays in offset 34 and “183”
displays in offset 35. For more information on converting decimal numbers to byte
values, see “Entering Values that Cross Byte Boundaries” on page 10 in Chapter 4.
For devices other than THGm, the
No. of Filters Used column indicates the number
of hardware filters used by the template. Each device has maximum number of
filters and this value can be useful in making sure you do not exceed this value.