Cisco ASA Audit Event: 209003

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 » 209003: Fragment database limit exceeded

209003: Fragment database limit exceeded

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-4-209003:Fragment database limit of number exceeded:src =source_address,dest =dest_address,proto = protocol,id =number.

Event 209003 is generated when too many IP fragments are awaiting reassembly simultaneously.The message contains the:

  • Maximum number of fragments.
  • Source and destination IP addresses.
  • Protocol.
  • Identifier.

How could you resolve this situation?

To prevent fragmentation, see the sysopt connection tcpmss bytes command in the command reference guide. If the events keeps recurring, it might denote a denial of service attack in progress. Contact the remote peer administrator or upstream provider.

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