On Fri, Sep 05, 2014 at 08:11:29AM +0000, [email protected] 
wrote:
> Please find tcpdump as requested,  note that 172.16.50.135 is nated to 
> internet facing/Public IP address

Your box is not answering queries. My best bet would be that PowerDNS
ist not configured to answer queries to 172.16.50.135 or that there is
a local firewall running on the actual box.

Assuming Linux, iptables -nvL please.

next time, please use tcpdump -np since this reduces the clutter.

Greetings
Marc

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