Two domains, two Ip ranges, can ping domain but not individual servers

Hi
I have 2 domains 3B and 4D, each with an ip range x.x.32.0 and x.x.170.0
In the 3B domain I have 3 DCs each with DNS in the AD
In 4D domain I have 2 DCs each with DNS in the AD
I am not using WINS or LMhosts
I can ping by ip address and get resolution to names in both directions one domain to the other.
I can ping the domain name in both directions but I cannot ping the DC names, any ideas why not?
Also if I ping the 3B domain it returns the ip address of DC3 but I would like it to return DC1 or DC2 - how or where do I change the settings so that this would happen?
Any help appreciated.
EricIT Systems and Asset ManagerAsked:
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omarfaridCommented:
if you run nslookup from command line, are you able to resolve names to ips?
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EricIT Systems and Asset ManagerAuthor Commented:
if I run nslookup on 3B domain the default server for 3B is DC1 with ip 170.3
If I run nslookup on 4D domain the default server for 4D is 4DDC1 with ip 32.60
Both are what I would expect.
But if I try to ping either way, it fails
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omarfaridCommented:
if you ping from the dns server it self or run nslookup,do they resolve to ip?
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EricIT Systems and Asset ManagerAuthor Commented:
I cannot ping the host name but if I use host.domain it will then resolve - I have a forwarder configured to the 4D domain.
I cannot ping the 3B DC1 from the 4D DNS server - again if I use the dc.3B it will resolve.

The routing is ok as I have checked using tracert.
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omarfaridCommented:
under your nic tcp/ip properties -> advanced tcp/ip settings -> dns , select append these dns suffixes and add your domain name
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EricIT Systems and Asset ManagerAuthor Commented:
do I just add the relative domain or do I add both domains to each card?
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EricIT Systems and Asset ManagerAuthor Commented:
Hi, I have added both domains in and it works, but surely this is a bodge because it is not actually solving the underlying problem as towhy the DNS does not resolve the names.  I cannot ping the 3B DCs from my PC either.  I would need to visit every machine that needs access to the other domain - or is this not the case?
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omarfaridCommented:
- for a dns server to resolve a name it needs FQDN (Fully qualified domain name) which includes the system name and the domain. When you added the domain name as described before, then the system will add the domain name to the system name when sending query to dns server.

Those systems where ping by name is not working, is dns configured there? if not, then you need to configure them (if they get IP from dhcp, then you can do that in dhcp) and let then register with dns server.

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EricIT Systems and Asset ManagerAuthor Commented:
Thank you, you helped me sort out a long standing problem, and you helped me understand better how DNS works, although I have still a great deal to learn.
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