Hello MLA,
thank you for your post.
PRTG Settings
Please run the PRTG Administration Tool on the Probe System, check the Probe Settings for Monitoring tab and make sure that both NICs are listed and the selection is Auto.
IP Routing
The Probe can easily handle multiple NICS, this is specially useful when you don't want to have routing between distinct networks. Just make sure that addresses don't overlap and remember that as a general rule you can only have and use a single gateway.
If your system has two nics with the addresses above, you'll be able to monitor:
NIC 10.0.1.0/24 - the default gateway nic
network 10.0.1.0/24 locally
network 0.0.0.0 via gw
NIC 10.0.200.0/24
network 10.0.200.0/24 locally
This does match with what you're describing, I just want to mention it because this leads to confusion in some cases.
SNMP Security
Please note that some SNMP agent implementation implements security by storing a list of Allowed Managers(Windows has this by default). Make sure that when setting-up your switches you've either selected All IP's or the Probe IP from the same subnet (from where the queries will originate).
Debugging
Please check out our SNMP Tester which is useful for troubleshooting SNMP, it will allow you to quickly run the "Uptime" query from any host against the switch to compare the results, this will allow you to do further troubleshooting.
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