Cisco ASA Audit Event: 106007

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.

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