Rule:

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Sid:
404

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Summary:
This event is generated when An ICMP Protocol Unreachable datagram is detected on the network.  

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Impact:
This could be an indication of improperly configured routing equipment or network host.

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Detailed Information: 
This rule generates informational events about the network.  Routers will generate this message when the transport protocol designated in the datagram is not supported in the transport layer of the final destination.  Large numbers of these messages on the network could indication routing problems, faulty routing devices, or improperly configured hosts.

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Attack Scenarios:
None Known

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Ease of Attack:
Numerous tools and scripts can generate these types of ICMP datagrams.

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False Positives:
None Known

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False Negatives:
None Known

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Corrective Action:
This rule detects informational network information, no corrective action is necessary.

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Contributors:
Original Rule writer unknown
Sourcefire Research Team
Matthew Watchinski (matt.watchinski@sourcefire.com)

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Additional References:
None


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