Just wanted to throw in that it is possible to manually add devices on the far side of the VPN (or anywhere else that is routable) and then set monitors on those manually created devices. The page asks for MAC but the value can be left blank, you only need to provide an IP address. The main advantage of adding the actual MAC is that if the device ever becomes automatically discovered, it will take overf the manually added element.
I fully understand this is not a perfect solution, it is awkward, it doesn't handle devices with DHCP addresses that might change, etc, but it might meet your immediate needs.
We already discover devices present in a supported local router's ARP table as long as the router exposes the table (we support a couple of routers that don't actually do this). The problem is that the ARP table won't expose any devices beyond the next hop on the VPN. To see those, we would have to reach into that remote device.
All possible, and I'll leave it to the product folks to prioritize.
On a related issue, has anybody encountered a need to add devices manually using a DNS hostname instead of an IP? I know I have. This would allow monitoring of services where the IP might change, and it would allow monitoring of dynamic DNS services themselves.
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