Some hosts are multi-homed and zabbix allows to add multiple interfaces per host. GREAT!

HOWEVER:

In the current monitoring, it is not visible when a backup interface suddenly goes offline, while in fact, this backup (or another) interface might be needed when the major interface would fail.

Thus losing the potential backup without knowing it is gone is considered a major problem.

My feature request is to add a function like:

1) option to allow enable/disable keep-alive check per host interface.

If the keep-alive succeed, no problem else: trigger alarm of the specific host interface becoming unreachable

2) option to allow for some other checks to test: like latency / packet-loss towards this additional interface(s)

Below explains partially the problem, but working with macro's etc for this might be considered huge workaround. Some devices/hosts we use have even many possible interfaces...

https://blog.zabbix.com/monitoring-a-dual-homed-machine-within-zabbix/11349/