we appreciate your contact.
If you really need that sort of granularity, then 870 sensors is indeed the way to go. In theory you don't need all of them, because if Ping from A to B works, Ping from B to A should work as well.
In any case. The easiest way to deploy this would be to create an Auto-Discovery group called "Site-to-Site" connectivity or similar on each remote probe with these settings:
|Sensor Management||Automatic sensor creation using specific device template(s)|
|Device Template(s)||Generic Device (Ping only)|
|IP Selection Method||List of individual IPs and DNS names (IPv4)|
And under IPv4/DNS Name List, paste the list of IPs or DNS names of each remote site. An Auto-discovery will begin and deploy one device (and one ping sensor) for each remote address that can be reached with Ping.
You can then either repeat this process on each remote probe or simply clone the whole group (with all device and sensors) to each remote probe.
Luciano Lingnau [Paessler Support]