User`s guide

Working with captured packets
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Figure 6.8. The “Capture Filters” and “Display Filters” dialog boxes
New This button adds a new filter to the list of filters. The currently entered
values from Filter name and Filter string will be used. If any of these fields
are empty, it will be set to “new”.
Delete This button deletes the selected filter. It will be greyed out, if no filter is
selected.
Filter You can select a filter from this list (which will fill in the filter name and
filter string in the fields down at the bottom of the dialog box).
Filter name: You can change the name of the currently selected filter here.
The filter name will only be used in this dialog to identify the filter for
your convenience, it will not be used elsewhere. You can add multiple
filters with the same name, but this is not very useful.
Filter string: You can change the filter string of the currently selected filter here.
Display Filter only: the string will be syntax checked while you are typing.
Add Expression… Display Filter only: This button brings up the Add Expression dialog box
which assists in building filter strings. You can find more information