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Query regarding Active Directory SRV records

Posted on 2009-05-05
Last Modified: 2013-12-24
Hi Experts

I had a query regarding LDAP/Kerberos SRV records I was hoping someone could help me with.

Let's say I have 5 DC's in my site. I want users to be able to authenticate to each.

Would I have LDAP and Kerberos SRV records with each of the 5 DC's listed? Is it one LDAP/Kerberos SRV record per DC, or is there only one LDAP/Kerberos record which holds all the DC's?

Secondly, say I want users to use on DC preferentially...I understand that I can set the priority/weight...would i be correct in saying that that the lower the priority the higher preference the DC has? And if the priorities are equal, then the lower the weight the higher the preference?

I have been reading from here, but it doesn't go into too much detail;

Question by:kam_uk
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LVL 70

Accepted Solution

KCTS earned 200 total points
ID: 24303585
The DNS server will automatically maintain SRV records for all DCs
If you want to start tinkering with the priority/weight (and I advise against it then)

Priority - low number = greater preference
Weight - high number = greater preference
LVL 57

Assisted Solution

by:Mike Kline
Mike Kline earned 200 total points
ID: 24303586
Yes you would have SRV records for each server.  See my screenshot -- I have 3 DCs in this test network
The lower weight would get less preference
See if this link helps with understanding weight/priority

LVL 57

Expert Comment

by:Mike Kline
ID: 24303606
KCTS -- if you have time can you send me an email off line (email on my profile) just want to ask you a quick question
LVL 70

Assisted Solution

by:Chris Dent
Chris Dent earned 100 total points
ID: 24303801

If you have multiple records of equal priority then the weights are summed and queries distributed according to the relative weights.

For example, if I had these two:

_ldap   SRV   0 25 389  server1.domain.com.
_ldap   SRV   0 50 389  server2.domain.com.
_ldap   SRV   0 25 389  server3.domain.com.

In this case the total weight is 100, conveniently converted into a percentage that's 100%. Seeing the weights above, we can see that the division of queries would be 25% to server1, 50% to server2 and 25% to server3.

If you were to determine usage and the weights don't all neatly match up to 100 you would do:

Percentage Usage = (Record Weight / Total Weight) * 100

LVL 70

Expert Comment

by:Chris Dent
ID: 24303804

> if I had these two:

Three... I can do math, but I can't count ;)


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