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Cisco Security

IP Fragmentation Buffer Full

 
Signature ID: 1200/0
Original Release:S149
Release:S212 (download)
Original Release Date:2005 March 04
Latest Release Date:2006 January 16
Default Enabled:True
Default Retired:False
CVE:CVE-2000-0305
Alarm Severity:Informational
Fidelity:100 

Description

This signature identifies when there is an extraordinary amount of incomplete fragmented traffic detected on the protected network. This could be due to an excessive number of incomplete fragmented datagrams, a large number of fragments for individual datagrams or a combination of quantity of incomplete datagrams and size/number of fragments in each datagram. This type of traffic is most likely an attempt to bypass security measures or Intrusion Detection Systems by intentional fragmentation of attack activity.

Recommended Filter

No recommended filters.

Benign Triggers

IP datagrams may be fragmented normally as they are transported across the network. While some fragmentation may be normal, large numbers of incomplete datagrams or large numbers of fragments per datagram is suspicious. Investigation of this traffic is especially important if the network is protected by a packet filtering firewall.

Download

To download this and other IPS update files, please go to Cisco Secure Software Download.

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