GEN:SID 1:405
Message ICMP Destination Unreachable Source Host Isolated
Summary This event is generated when An ICMP Source Host Isolated datagram is detected on the network.  
Impact This is an indication of improperly configured routing equipment or network host.  RFC 1812 indicates that ICMP Type 3 ICMP Code 8 messages should never be generated.
Detailed Information This rule generates informational events about the network. Routers should never generate ICMP Type 11 Code 8 as they are in violation of RFC1812.   Large numbers of these messages on the network could indication routing problems, faulty routing devices, or improperly configured hosts.
Affected Systems  
Attack Scenarios None Known
Ease of Attack Numerous tools and scripts can generate these types of ICMP datagrams.
Corrective Action This rule detects informational network information, no corrective action is necessary.
Additional References None