If I name my Active Directory domain "foo.local", what domain do I tell the (Windows) computer to join to? Do I put in "foo.local" or just "foo"?
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2See: serverfault.com/questions/17255/… serverfault.com/questions/47087/… serverfault.com/questions/89644/… for discussion of the usage of .local Quoting Microsoft Using unregistered suffixes is not recommended. Using single label names, such as .local, is not supported.– ZoredacheJun 26, 2010 at 3:53
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Interesting, I'm sure I saw Microsoft documentation that suggested .local should be used, possibly for Small Business Server. Agreed that this is not a good idea.– pjc50Jul 22, 2010 at 15:51
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2 Answers
You can join the domain using foo or foo.local. Foo is the single label NetBIOS name of the domain and foo.local is the DNS FQDN of the domain. Using either one to join the domain is valid, although I prefer to always type the FQDN.
You would put foo.local, but you shouldn't use a .local TLD for an AD domain.
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Mark: I have worked for a company that had named its AD domain 'company-initials.local', with a NetBIOS-friendly name of 'companyname'. Although I was not involved in the naming decision, which took place before my arrival, I observed no obvious ill effects. Given your extensive knowledge of the subject, I am very curious to understand why you would recommend against this practice.– SkyhawkJun 25, 2010 at 23:12
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1@Miles Erickson - .local isn't a real TLD. What's to say it won't ever become one? If all of a sudden someone else owns yourcompany.local, you have the "internal DNS thinks it is authoritative for a zone that it really isn't" problem. The generally accepted way of doing it safely is to make it a subdomain of a current domain that you own that isn't routable on the Internet. Something like ad.yourcompany.com or internal.yourcompany.com, etc.– MDMarraJun 25, 2010 at 23:15
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@Miles Erickson, I suspect you never had computers running OS X on that network either. Bonjuer does weird things where .local is used. Read up on the discussion on some of the questions I linked to. Jun 26, 2010 at 3:50
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& @Zoredache: Thanks, makes perfect sense. I appreciate you taking the time to explain!– SkyhawkJun 27, 2010 at 5:25