September 2003
Intermediate to advanced
624 pages
15h 49m
English
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3.21. Finding Domain Controllers and Global Catalogs via DNS
Problem
You want to find domain controllers or global catalogs using DNS lookups.
Solution
Domain controllers and global catalog servers are represented in DNS
as SRV records. You can query SRV records using
nslookup by setting the
type=SRV, such as the following:
> nslookup Default Server: dns01.rallencorp.com Address: 10.1.2.3 > set type=SRV
You then need to issue the following query to retrieve all domain controllers for the specified domain.
> _ldap._tcp.<DomainDNSName>You can issue a similar query to retrieve global catalogs, but since they are forest-wide, the query is based on the forest name.
> _gc._tcp.<ForestDNSName>You can even find the domain controllers or global catalogs that are in a particular site or that cover a particular site by querying the following:
> _ldap._tcp.<SiteName>._sites.<DomainDNSName> > _gc._tcp.<SiteName>._sites.<ForestDNSName>
See Recipe 11.18 for more information on site coverage.
Discussion
One of the benefits of Active Directory over its predecessor Windows NT is that it relies on DNS for name resolution. Active Directory uses DNS to locate servers that serve a particular function, such as a domain controller for a domain, global catalog server, PDC Emulator, KDC. It also uses the site topology information stored in Active Directory to populate site-specific records for domain controllers.
The DC locator process relies on this information in DNS to direct clients to the most optimal server when ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.