BIG-IP DNS with vmotion/SRM/OTV - 2DC's

Hey everyone -

 

We have an active DC and a cold DC. (meaning, the cold DC would not have active running VM's. If there is a failure, a VM will use SRM/vmotion to transfer to the other DC).

 

My question is, if the VM host networking stays the same and use the same default gateway. Traffic will continue to use the Default Gateway through DC1. Will the BIG-IP DNS be able to detect the failure (through iQuery) since the LTM would not?

 

Is there an advanced monitor I could use on the BIG-IP DNS box to detect a failure of the VM or LTM VIP and then remain on the switched Public IP?

 

Thanks!