alert icmp $EXTERNAL_NET any -> $HOME_NET any (msg:"GPL DELETED TFN client command BE"; icmp_id:456; icmp_seq:0; itype:0; reference:arachnids,184; classtype:attempted-dos; sid:2100228; rev:4; metadata:created_at 2010_09_23, signature_severity Unknown, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)