Tcpdump on background

[fluca1978]

Hi,
I found a tcpdump active on my box:

# ps -auxw | grep tcpdump
root   55764  0.0  0.6  5716  2216  ??  S     7:45AM   0:00.01 /usr/sbin/tcpdump -s 256 -v -l -n -e -ttt -i pflog0

I'm not sure this is really wanted. Before dropping to a shell I've seen the pflogs (option 10 on the console), then I quitted and dropped to a shell. Could it be such process related to the previous pflogs session? I killed it and it restarted after a few seconds, then I killed again and now it seem gone. Is something bad happening or is it normal?