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LDAP Traffic between Domains

Posted on 2016-09-01
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Last Modified: 2016-10-22
We have recently added our first child domain into our forest and we are currently seeing LDAP traffic between the root and child domain which we were not expecting. We have noticed that all of our root domain PCs seem to be sending LDAP packets to the child domains DC when logging on, unlocking PCs etc. Is there any way of preventing the traffic between the domains? Any advice on the matter would be highly appreciated. Thanks.
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Question by:stanleyltd
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Adam Brown earned 500 total points
ID: 41780184
There isn't a way to prevent LDAP traffic between domains in the same forest. At least, not if you want AD to function properly. Domain Joined computers have the capability of accepting logins to any domain in the same forest. The LDAP traffic you're seeing from the root domain computers to child domain DCs is a lookup to ensure the child domain is available for login if needed. This is normal. The only way to stop unwanted intra-domain LDAP lookups (aside from using a firewall, which would likely cause tons of unwanted error messages) is to have the domains in separate forests and utilize selective authentication to prevent each domain's systems from being able to authenticate against the other domain.
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