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Domain Trust via NAT

Posted on 2012-04-11
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Last Modified: 2012-04-16
Dear Expert,

I need some advice pertaining on the windows 2008 AD - external domain-trust via NAT, DNS forwarding has been setup successfully from both sites, but can't seem to get the authentication working.

I have 2 site connect via point-to-point VPN:

Site A - AD Server IP 10.150.0.1
Domain: domain-A.internal

Site B - AD Server 10.10.0.1   (Original IP subnet)
Site B - AD Server 10.190.1.1 (NAT IP Subnet back to Site A)
Domain: domain-B.internal

P/S: The NAT only applied on Site B.

Test result:
AD Server (Site A)  able to ping  NAT AD Server (Site B)
AD Server (Site B)  able to ping  AD Server (Site A)

AD server (Site B)  able to ping  domain-A.internal
AD server (Site A)  can't ping   domain-B.internal  (somehow it's pinging actual IP 10.10.0.1 instead of NAT IP 10.190.1.1)
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Question by:peacefullee
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unsatiated earned 500 total points
ID: 37833573
Your DNS entries and NAT are not mixing well.  Because you are NAT'ing the box to the 10.190.1.1 IP address, that IP does not exist in any DNS record in your DNS zone, therefore, domain-b.internal will always resolove to 10.10.0.1 instead of the NAT address you are looking for which is 10.190.1.1.  Why are you NAT'ing that AD subnet to that anyway?  Is this a constraint due to that subnet being alreayd in use on the A side?

You can ADD DNS entries for all those NATd IP addresses into DNS to remedy, but I suggest looking at why you are even NATing those addresses.
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Author Closing Comment

by:peacefullee
ID: 37853931
Thanks for advice, managed to get NATed exemption on AD.
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