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vlan pc's unable to login to domain

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Sep 23rd, 2005
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setup new nt 4 wkstations on vlan....they can ping DC but get error msg when trying to login to domain...."domain controller not found"

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tekha Fri, 09/23/2005 - 11:47
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Are they able to ping the DC by IP address or by name?

I seem to recall somthing about the PC needing to know that the "domain-name = ip of DC" in the hosttable, that is if you are not running DNS or WINS.

James.Gosnold Sat, 09/24/2005 - 03:00
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Probably name resolution issue. Check LMHOSTS file for PDC name to IP mapping or name server if this is what you use on your network.

Richard Burts Sat, 09/24/2005 - 12:37
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Is the Domain Controller in the same VLAN or is it in a remote VLAN? Are there other PCs in the VLAN that are able to login to the domain or are no PCs in this VLAN able to login to the domain?

My guess is that you need to configure ip helper-address on the VLAN interface pointing to the address of the Domain Controller. The ping using ICMP is sent as a unicast. And the fact that ping works does prove that the PCs have IP connectivity. But the PCs may be trying to find the Domain Controller by sending NetBIOS subnet broadcasts. Try adding a helper-address and let us know if the situation improves.




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