The feature you really want is called DNS doctoring. With DNS doctoring when you configure a nat the firewall with "doctor" the DNS response from internal clients to present your internal ip address instead of the public one. DNS doctoring is not yet a feature on the Palo Alto. Contact your sales team and ask if there is a Feature Request pending you can add a vote for. In the mean time, if you setup DNS proxy from the link Hulk provided, you can perform the following steps to have your setup act as desired. 1-configure the DNS proxy 2-add static entries (step 5 in the documentation) with the internal address for all your server resources 3-change you DHCP server to present the PA as the DNS server for your LAN 4-update any static computers to use the PA for DNS
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