GEN:SID 1:413
Message ICMP IPV6 Where-Are-You
Summary This event is generated when a network host generates an ICMP IPV6 Where-Are-You datagram.
Impact ICMP Type 33 datagrams are not expected network traffic.  Hosts generating ICMP Type 33 datagrams should be investigated for hostile activity.
Detailed Information ICMP Type 33 is an undocumented extension to RFC 1812 and RFC 792.  Its current use it not defined by an approved RFC.  
Affected Systems  
Attack Scenarios None known
Ease of Attack Numerous tools and scripts can generate this type of ICMP datagram.
Corrective Action Hosts generating ICMP Type 33 datagrams should be investigated for hostile activity.
Additional References None