alert tcp $HOME_NET any -> $EXTERNAL_NET ![7680,1521] (msg:"ET P2P BitTorrent peer sync"; flow:established; content:"|00 00 00 0d 06 00|"; depth:6; threshold:type limit, track by_dst, seconds 300, count 1; reference:url,bitconjurer.org/BitTorrent/protocol.html; classtype:policy-violation; sid:2000334; rev:14; metadata:created_at 2010_07_30, confidence Medium, signature_severity Informational, updated_at 2025_06_30;)