alert ip $EXTERNAL_NET any -> $HOME_NET any (msg:"GPL DOS IGMP dos attack"; fragbits:M+; ip_proto:2; reference:bugtraq,514; reference:cve,1999-0918; reference:url,www.microsoft.com/technet/security/bulletin/MS99-034.mspx; classtype:attempted-dos; sid:2100272; rev:11; metadata:created_at 2010_09_23, confidence Medium, signature_severity Minor, updated_at 2019_07_26;)