alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET DELETED F5 BIG-IP 3DNS TCP Probe 1"; id:1; dsize:24; flags:S,12; content:"|00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00|"; window:2048; reference:url,www.f5.com/f5products/v9intro/index.html; classtype:misc-activity; sid:2001609; rev:13; metadata:created_at 2010_07_30, signature_severity Unknown, updated_at 2019_07_26;)