I am running an External DNS service - OpenDNS. It requires setting up a VM DNS server that forwards DNS queries to OpenDNS sitting outside the ASA on a public IP (188.8.131.52)
On the VM DNS server (192.168.2.4) , I constantly get DNS resolution failing. I've contacted OpenDNS support and they told me that they see my TCP connection to their server failing with Timeouts.
It looks the DNS Server is correctly forwarding out the queries and getting a respond.
Does the teardown duration of 0:00:00 look correct?
On my ASA logs:
Source IP Source Port Destination IP Destination Port Description
192.168.2.4 40067 184.108.40.206 40067 Built dynamic UDP translation from inside: 192.168.2.4/40067 to outside 220.127.116.11/40067
192.168.2.4 40067 18.104.22.168 53 Built outbound UDP connection for outside:22.214.171.124/53 to inside:192.168.2.4/40067(126.96.36.199/40067)
188.8.131.52 53 192.168.2.4 40067 Teardown UDP connection for outside:184.108.40.206/53 to inside:192.168.2.4/40067 duration 0:00:00 bytes 66