Intra-Site latency only for Active Directory DNS zones

Question

Hello support,

we've 2 DCs in the same site that are currently working for AD changes.
Same DCs have delays in replicating DNS zone (AD integrated): replica can take few seconds up to few minutes to replicate.
We see that every DC in the same zone has:
* itself in SOA
* a different serial

Can someone help us to identify the root cause?

Thank you

Answer 1

Hello AndreaCerrito-0508,

Thank you for posting in our Q&A forum.

Please run the following commands to on PDC and check the result.
repadmin /showrepl C:\rep1.txt
repadmin /replsum C:\rep2.txt
repadmin /showrepl * /csv >c:\repsum.csv

If all the results are OK, it seems AD replication works fine.

We can see "By default, this interval is 15 seconds in Windows Server 2003 and later versions." in the link below.

How to Modify the Default Intra-Site Domain Controller Replication Interval
https://learn.microsoft.com/en-us/troubleshoot/windows-server/identity/modify-default-intra-site-dc-replication-interval

Also, I can see different "Serial Number" in forest zones and domain zones on one DC, but they are the same result on different DCs.

I mean "Serial Number" is 16 in forest zones on DC1,
and "Serial Number" is 368 in domain zones on DC1.
I mean "Serial Number" is 16 in forest zones on DC2,
and "Serial Number" is 368 in domain zones on DC2.

Hope the information above is helpful.

Best Regards,
Daisy Zhou

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Answer 2

Hi @Anonymous ,

i'm an @Andrea Cerrito partner,

following log report requested

268079-rep1.txt268165-rep2.txt268115-repsumcsv.txt

Serial-numbers (NOW):
_msdcs SN is 258 on ADNODE-1 (SiteB) e ADNODE-3 (SiteC) and 259 on ADNODE-2 (SiteB)
new.mydomain.it SN is same on all nodes.