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7-15

Actions for Display Filters

Table 7-5 shows actions available for display filters:

See Multi-State and Multi-Statement Filters for more information on actions in 

multi-state filters.

Press the 

 button to bring up a dialog box to create a 

counter condition. You specify a counter name and a value to test against. When 

you specify the counter condition and click the 

 button, the counter condition 

appears in the 

 box. Counter conditions are only available 

with capture filters.
A counter condition is a special condition for accepting/rejecting a packet based on 

a counter value. Logically, a counter condition functions like a filter template. The 

settings for counters are “conditional flags” for subsequent actions. For example, 

set the counter name to “Counter 1." Set the test value in the >= field to l00. When 

Counter 1  reaches 100, the filter will carry out the actions that you have chosen for 

subsequent packets. 
You can use a counter just like a filter template. For example, you could create the 

phrase FTP AND Counter 4 >= 20 in the Template Combination box. This would 

select FTP packets when Counter 4 reaches a value of 20. For THGm, one of seven 

custom counters can be used as the test counter. 
The counter “test values” set in this window are global values. For multi-statement 

filters, if you set a counter test value in one statement, if you try to change it in 

another statement you will receive a warning message. See Multi-State Filters for 

more information on actions in multi-state filters.
Note that if you select the 

 box, choose a counter, but leave 

the “test value” set at 0, the result will be that the filter condition is always true and 

all actions will be taken immediately. 

Display Packet

Display the resultant data.

Change Filter Operation

Go to a different filter state for processing the next incoming packet. 
The state can be the current state or any other state defined in the dis-
play filter.