I have the Dude running on my network monitoring some laptops and other devices that have multiple IPs. When the first IP on the address list is unreachable, then the Dude claims that the device is “Down Complete” (it should be “Down Partial”).
And that’s the better case. 
I have device with multiple addresses on different interfaces and when interface holding the second address died, Dude was still happily showing green “all ok” box for the device. Not sure what can be done about that..