Cisco ASA Audit Event: 106007

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 » 106007: Deny inbound UDP due to DNS

106007: Deny inbound UDP due to DNS

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-2-106007: Deny inbound UDP from outside_address/outside_port to inside_address/inside_port due to DNS {Response|Query}.

Event 106007 is generated when a UDP packet containing a DNS query or response is denied. The message contains: 

  • The inside IP address and port number.
  • The outside IP address and port number.
  • Information on whether the UDP packet contained a DNS query or response.

How could you resolve this situation?

If the inside port number is 53, the inside host probably is set up as a caching name server. Add an access-list command statement to permit traffic on UDP port 53 and a translation entry for the inside host. If the outside port number is 53, a DNS server was probably too slow to respond and so the query was answered by another server.

We can help you simplify log management and improve your organization's security with EventLog Analyzer.

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