| GEN:SID | 1:458 |
| Message | ICMP unassigned type 1 |
| Summary | This event is generated when an ICMP Type 1 datagram with an undefined ICMP Code is detected on the network.
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| Impact | ICMP Type 1 datagrams are not currently used by any known devices.
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| Detailed Information | ICMP Type 1 is not defined for use and is not expected network activity. Any ICMP datagram with an undefined ICMP Code should be investigated.
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| Affected Systems | |
| Attack Scenarios | None known
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| Ease of Attack | Numerous tools and scripts can generate this type of ICMP datagram.
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| Corrective Action | Ingress filtering should be utilized to block incoming ICMP Type 1 datagrams |
| Additional References | None
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