URGENT: block IGMP protocol functionality

a new form of network distortion hack used by MCAST.NET

http://www.websecurity.mobi/computer-help/555-huge-computer-hack-server.html
http://www.microsoft.com/technet/security/Bulletin/MS06-007.mspx
http://www.networksorcery.com/enp/protocol/igmp.htm
http://www.juniper.net/security/auto/vulnerabilities/vuln2866.html
http://www.hackerz.ir/forums/ceocn-ac/449-list-hack-tools.html <–iran hacking site