Cisco ASA Audit Event: 209004

Cisco ASA Events

The logs of network perimeter devices such as firewalls, antivirus applications and intrusion prevention systems contain crucial information that helps to pre-emptively block security attacks and breaches. Hence, it's mandatory for you to monitor and audit these logs. Because Cisco ASA provides the combined functionality of all the three, it becomes all the more important to monitor its logs. 

ManageEngine's EventLog Analyzer, a comprehensive log management solution, collects and analyzes the log data from Cisco ASA devices, triggers alerts and generate reports on detected security incidents thus helping you to take suitable measures against security threats, if any. 

Cisco » 209004: Invalid IP fragment

209004: Invalid IP fragment

Cisco ASA is a security device that provides the combined capabilities of a firewall, an antivirus, and an intrusion prevention system. It also facilitates virtual private network (VPN) connections. It helps to detect threats and stop attacks before they spread through the network.

Message: %ASA-4-209004: Invalid IP fragment,size=bytes exceeds maximum size=bytes:src =source_address,dest =dest_address,proto=protocol,id =number.

Event 209004 is generated when an IP fragment is malformed. The total size of the reassembled IP packet would have exceeded the maximum possible size of 65,535 bytes. The message contains information on the:

  • Actual size of the IP fragment.
  • Maximum size of an IP fragment.
  • Source and destination IP addresses.
  • Protocol.
  • Identifier.

How could you resolve this situation?

If the message keeps recurring, it might denote an intrusion event in progress. Contact the remote peer administrator or upstream provider.

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