Windows Client Secondary DNS

[JessC]

I have a concern about secondary dns.

Scenario : 
We have 2 domain controller in our domain environment using 2 physical server.
Now we want to configure DFS replication using the physical server for our file share for fault tolerance purpose. Everything's working fine except this:

Client PC will access the file from namespace: \\ourdomain.local\namespace\Network_Share 
The issue is when I tried to disconnect server 1 from the network, there's noticeable delay when accessing the file share from client pc.

 

Settings:
Server 1                  
IP : 10.10.10.20/24               
Primary DNS : 127.0.0.1   
Server 2                         
IP: 10.10.10.21/24
P-DNS: 10.10.10.20  
S-DNS: 127.0.0.1
Client PC
IP:10.10.10.100/24
P-DNS: 10.10.10.20
S-DNS: 10.10.10.21

 

I'm not sure but I think the reason of the delay is that client pc is trying to contact primary DNS first and after number of tries, it goes to secondary DNS server. 
IF it is the reason, is it possible to shorten the number of tries for it to refer to secondary DNS ?

 

PS. this is done in virtualbox for testing but soon will be implemented in live server.

 

Thanks in advance.

[Acedia]

IIRC Windows is pulling the primary DNS for a whole second before it even tries the secondary DNS server. I assume the Client PC is using Windows? You could check this using Wireshark and see if that's what causing the delay.

Does the delay presist or is it gone after a few minutes? The DFS server could also fail to pull server 1 either for DNS or AD.

Are the DFS servers also Server 1 and 2 or is the file server a 3rd one? That could also introduce additional delay.

[JessC]

On 3/30/2019 at 9:52 AM, Acedia said:

IIRC Windows is pulling the primary DNS for a whole second before it even tries the secondary DNS server. I assume the Client PC is using Windows? You could check this using Wireshark and see if that's what causing the delay.

Does the delay presist or is it gone after a few minutes? The DFS server could also fail to pull server 1 either for DNS or AD.

Are the DFS servers also Server 1 and 2 or is the file server a 3rd one? That could also introduce additional delay.

Server 1 and 2 are domain controller and also a dfs server.