Also, I've noticed the netmask is different on the two esxi hosts. Would that make a difference?
172.x.x.x (netmask: 255.255.255.0)
10.x.x.x (netmask: 255.255.240.0)
Is that possible that something needs to be enabled on the physical adapters? Or, there is gateway somewhere that needs to
configured for Channel network? (BTW, I did a 'tracert' on my primary and secondary servers; the traceroute used the default
gateway for my public/mgmt IP.)