On 21/01/2021 02:30, Hoang Quynh wrote: > Dear Rowland. > > Please help me DNS resolve. > > Name -> IP (only DNS server ok, the client can not) > IP -> Name ( DNS server ok, client ok) > Have you created the reverse zone in AD ? If you have, have you created the PTR records for the fixed ipaddresses in the reverse zone ? Rowland