4.4 Triggers
KSnuffle provides triggers which can control when packets are
displayed. Associated with each sniffer or replayer
are two triggers, the start and stop triggers.
These are displayed on the Filters/triggers page.
Each trigger is a packet filter, and is constructed in the same
way as the main packet filter. Note,
however, the the triggers are applied to packets independantly of
the main filter (ie., a packet can be passed by a trigger even
though it is not passed by the main filter).
There are five trigger settings:
- All packets
All packets which are accepted by the main packet filter are
displayed. In this case both of the the triggers are ignored.
- Until stop
Packets are displayed until a packet is received which matches
the stop trigger. After this, no further packets are
displayed. The start trigger is ignored.
- From start
No packets are displayed until a packet is received which
matches the start trigger. After this, all packets are
displayed. The stop trigger is ignored.
- One shot
No packets are displayed until a packet is received which
matches the start trigger. After this, all packets are
displayed until one is received which matches the stop
trigger. From this point, no further packets are displayed.
- Repeat
This is the same as One Shot, except that after the
stop trigger is matched, the sniffer or
replayer returns to waiting for the start trigger
to be matched.
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