Solved

Child domain LDAP queries

Posted on 2009-07-08
6
872 Views
Last Modified: 2012-05-07
I'll get to the question first.  My server, which is part of a child domain is sending LDAP requests to the primary root domain/forest controllers.  Why?  I don't want this to happen.

Here is the setup
2 total domains
Root domain/forest = abc.com
Child domain = xyz.abc.com
DC in child domain = AD1.xyz.abc.com
Another server in the child domain has ad1.xyz.abc.com as the ONLY DNS and WINS server. Of course that server is part of xyz.abc.com domain. The firewall blocks all AD communication (DNS, WINS, LDAP, RPC, Kerberos, SAM/LSA, Netbios, NTP, etc.) EXCEPT traffic between primary and child domain DC's.

Logins to child domain with primary domain accounts is slow (but successful), most likely since LDAP-UDP commumications from server are purposefully blocked.  Is it asking to much for my child DC to do ALL the authentication work?  Why are my other servers even trying to contact the root domain?  The reason I am doing this is for security but I don't know if it is a good or best practice.
0
Comment
Question by:damien1234
  • 4
  • 2
6 Comments
 
LVL 70

Accepted Solution

by:
Chris Dent earned 500 total points
Comment Utility

Global Catalog?

Chris
0
 
LVL 1

Author Comment

by:damien1234
Comment Utility
The DC in the child domain is a Global Catalog too.
0
 
LVL 70

Expert Comment

by:Chris Dent
Comment Utility

Are they in the same site in AD?

Chris
0
Why You Should Analyze Threat Actor TTPs

After years of analyzing threat actor behavior, it’s become clear that at any given time there are specific tactics, techniques, and procedures (TTPs) that are particularly prevalent. By analyzing and understanding these TTPs, you can dramatically enhance your security program.

 
LVL 1

Author Comment

by:damien1234
Comment Utility
So I created a new site and put the child DC in it.  I then logged on and saw a LDAP-389-UDP and a SAM/LSA-445-TCP packet dropped.  Login was successful but slow.
0
 
LVL 1

Author Comment

by:damien1234
Comment Utility
Well, I found a white-paper from Microsoft which was specifically about how to setup DC-DC communications through firewalls AND guarantee that the clients in each Site could only authenticate with the DC in their domain. It talked about setting up IPSEC but at the end of the day my method is exactly the same except my DC-DC traffic is not encrypted... and I don't need it to be encrypted.  My firewall guarantees that ONLY the DC's can talk to each other.  Anyway this has nothing to do with the behaviour of the other servers trying to contact DC's in the other site.  If Microsoft says I am doing everything right then maybe I'm just being anal.  After all authentication works.

Critical Points:
DC's need to be GC's
If Sites are used then replication and replication traffic is ALL that matters, nothing else.

It's beautiful, NONE of my other severs can browse an AD domain other than their own!  This is exactly what I wanted to have happen!  WooHoo!
0
 
LVL 1

Author Closing Comment

by:damien1234
Comment Utility
See my final explanation.  It's critical that the DC is a GC.  It's not as critical for the child to be in a different AD site since that really is all about replication (at least in my scenario anyway)
0

Featured Post

What Is Threat Intelligence?

Threat intelligence is often discussed, but rarely understood. Starting with a precise definition, along with clear business goals, is essential.

Join & Write a Comment

There are two modes of restricted groups GPOs. Replacing mode:   Additive mode:   How do they work? Replacing mode: Everything (users, groups, computers) that is member of the local administrators group will be cleared out. After th…
The saying goes a bad carpenter blames his tools. In the Directory Services world a bad system administrator, well, even with the best tools they’re probably not going to become an all star.  However for the system admin who is willing to spend a li…
This tutorial will walk an individual through the process of transferring the five major, necessary Active Directory Roles, commonly referred to as the FSMO roles from a Windows Server 2008 domain controller to a Windows Server 2012 domain controlle…
This tutorial will walk an individual through the process of configuring their Windows Server 2012 domain controller to synchronize its time with a trusted, external resource. Use Google, Bing, or other preferred search engine to locate trusted NTP …

771 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

9 Experts available now in Live!

Get 1:1 Help Now