Asymmetric traffic because of closing SAT on VIP

Hi all,

 

I closed SAT (from Automap to None) on the DNS VIP, because of passing through the source IP addresses which make DNS queries to make the Qradar logs meaningfull. I also set the DGW of the DNS nodes behind the VIP as F5 self IP.

 

We started to take the DNS logs to Qradar with the source of the queries, but i realized that the DNS doesn't work for the clients/servers which are at the same subnet with the DNS servers behind the VIP no longer. Because, the DNS servers are returning directly to the client/servers which are at the same subnet, not returning to F5.

 

I have a workaround solution for that case (creating another DNS VIP with the same nodes and setting the SAT as Automap) but with this solution we cannot get the logs for the relative subnet.

 

Any solution to prevent this asymmetric traffic without openning the SAT?

 

(BIG IP LTM 12.1.0)

 

Thanks