alert icmp $EXTERNAL_NET any -> $HOME_NET any (msg:"GPL ICMP_INFO PING LINUX/*BSD"; dsize:8; id:13170; itype:8; reference:arachnids,447; classtype:misc-activity; sid:2100375; rev:7; metadata:created_at 2010_09_23, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)