Hi ,
Welcome to our new Microsoft Q&A Platform.
>>is it recommended for client register both device tunnel and user tunnel IPs with DNS server? is it ok fine to register only device tunnel IP with DNS as it is required for manage-out?
Best practice is to define the RegisterDNS element only on the device tunnel if you are using it.
Please refer the following link for more information:
https://directaccess.richardhicks.com/2018/05/29/always-on-vpn-client-dns-server-configuration/
Please Note: Since the website is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.
>>Have two IP addresses registerd in DNs will it cause name resolution issues.
The different IP will not cause resolution issues.
Best Regards,
Candy