I ran a discovery with the router ip configured on our firewall which also are layer 3 device for the network.

It's a Watchguard XTM 5 Series.

I entered the /24 network that we have configured.  IP range 192.168.100.1-254

I set the read and write community strings to "public" which I have confirmed are configured as such in the firewall.  Tested with snmpget snmpwalk and also another monitoring tool is successfully pulling SNMP data from the firewall.

When I run the discovery I receive a message that says "Device mapping does not exist for this map?

I am assuming this is a message indicating no devices were discovery on the subnet?

Please advise.  Thank you.