It certainly sounds like you have not configured Sites and Services properly.
You need to start by defining your subnets in AD Sites and Services, then create the sites and assign one or more subnets to each site. Once this is done then clients will use a DC in their own site in preference.
To keep traffic totally local, you also need to make sure that clients are configured with the address of their local DNS server as the preferred DNS server and that each site has at least on DC configured as a Global Catalog Server.
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by: SteveH_UKPosted on 2008-01-07 at 11:15:41ID: 20602186
The usual cause is that the domain server in Asia is a more recent edition than the one locally. Another cause can be if you haven't configured Active Directory Sites & Services with multiple sites and subnets. The subnets are needed for the computers to identify where they are located.
Are your domain controllers all at the same version? Do you have AD sites configured correctly? Have you run DCDIAG and NETDIAG tests to check that your DCs are communicating correctly?
DCDIAG and NETDIAG can be downloaded from the Microsoft website.