Exchange 2007 CCR backup can't find passive node
I have a client running a two nodes Exchange 2007 CCR cluster. Both nodes have dedicated backup NIC. I am trying to backup this Exchange 2007 CCR cluster with the existing NetBackup 18.104.22.168 environment (single Master and multiple Media servers running Windows 2008 R2 x64). Since I am using dedicated backup NIC to offload backup traffic from production NIC, I have to edit hosts file on Master & Media servers so that Exchangle client name will resolve to the corresponding backup IPs. Right now, I have to update hosts file on all Master & Media servers whenever the Exchange cluster failover. Is there any way that I can "bind" a backup IP together with Exchange CCR so that I can get redirected to the passive node for backup?
Thanks in advance.