Yes, there are ways in Perl to automate this - now you just need to define what you are automating!
As moritz alluded to, you could open a pipe from the tcpdump command, parse the output from that command and do something with that.
Please be more specific about what you are trying to achieve, maybe show some sample output from the tcpdump command, and what the desired result is. The friendly Monks will be your, erm, friend.
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