I am not sure what happened as of late, but it seems that my snmp traffic sensor is losing connection. I am connecting this sensor to an off site router's WAN interface using it's public ip address. It seems to connect and then looses connection after a couple minutes in PRTG and keeps doing that over and over. PRTG sits on a machine behind a load balanced (Nat'd) firewall and we do have a vpn tunnel to this remote router. The access rule we have on the remote router does allow for access to port 161 from any source ip and I can see in the log the source ip on the incoming log only shows one of our ip's from our load balanced network. For whatever reason the one internet connection it won't work over, so when it starts using that line PRTG starts disconnecting. If I connect to it's private address since we have the vpn tunnel it works fine, but it obviously isn't as reliable as the sensor is dependent on the vpn tunnel being up. This is seemed to work in the past and kind of just started a month or so ago for unknown reasons. I am trying to see if this is a limitation of PRTG or if maybe it is an issue with trying to connect to the public address of the remote router while we have a vpn tunnel to that network.
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