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Chapter 3
Windows and Menus
3-16
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refilter the data and display the desired packets, click on the packet types
that you want to view again. The data filtered out during capture is not
accessible. For example, after capture, you cannot recover Pass Token (PT)
FDL packets if they were not enabled during capture.
Basic Filter Logic
A filter behaves differently depending on whether you select addresses on
the
Filter by Address
tab. If no addresses are selected, the filter uses all
addresses and combines the
FDL Filter
and
FMS Filter
choices, and
captures the types of packets checked in those dialog boxes. If any
addresses are selected on the
Filter by Address
tab, incoming packets
are first screened for their address. If the address is one of the selected
addresses, it is then compared to the FDL filter and the FMS filter.
Pseudocode for the filter follows:
If no addresses are selected in the
Filter by Address
tab:
Packets Captured = FDL FMS Filter
If addresses are selected in the
Filter by Address
tab:
Packets Captured = Address(es) * (FDL FMS Filter)
Where + stands for
or
and * stands for
and
.
Filter Dialog Box
To view the
Filter
dialog box for a filter window, right-click the mouse to
bring up the
Capture
menu and select
Filter Settings
, or you can click the
Filter Settings
toolbar button. The title bar of a filter displays the name of
the filter window to which it is attached. The filter appears as a dialog box
with three tabs—
FDL Filter
,
FMS Filter
, and
Filter by Address
. You can
open the
Filter
dialog box any time before, during, and after capture, or you
can hide it from view.
The following sections describe the tabs on the
Filter
dialog box.