How to use udp monitor in nPath

I configired nPath virtual server for some UDP service, and also setup

 

udp monitor. UDP monitor seems to send health check packet to

 

the IP address of physical network interface, not virtual IP aliased to

 

loopback. Is there any way to send health check packet to members via

 

virtual IP/port and with MAC address of physical network interface of members,

 

like dispatching user request by nPath?

 

 

yasuo asakawa