Added note about DNS NRPT

Added note about DNS NRPT with P2S AD Client, so users can troubleshoot their current in-use DNS servers when making modifications to the XML.

Author: ryanborMSFT

articles/vpn-gateway/openvpn-azure-ad-client.md

@@ -181,6 +181,10 @@ You can modify the downloaded profile XML file and add the **\<dnsservers>\<dnss
 </azvpnprofile>
 ```
 
+> [!NOTE]
+> The OpenVPN Azure AD client utilizes DNS Name Resolution Policy Table (NRPT) entries, which means DNS servers will not be listed under the output of `ipconfig /all`. To confirm your in-use DNS settings, please consult [Get-DnsClientNrptPolicy](https://docs.microsoft.com/en-us/powershell/module/dnsclient/get-dnsclientnrptpolicy?view=win10-ps) in PowerShell.
+>
+
 ### How do I add custom routes to the VPN client?
 
 You can modify the downloaded profile XML file and add the **\<includeroutes>\<route>\<destination>\<mask> \</destination>\</mask>\</route>\</includeroutes>** tags