I am getting started with Bro, and am using Robin's 1.4 stand-alone cluster branch. I was trying to detect some IRC traffic using DPD, but realized that it was being filtered. In the Workshop 2009 materials, it mentioned adapting the packet filter by adding the -f "tcp". I tried that, tested it on my pcap file, and it worked. How do I enable/disable the -f "tcp" option in the cluster configuration?