How Does PRTG Monitor Used Bandwidth?
If you check bandwidth usage with SNMP, you can find out the total bandwidth used as well as used bandwidth for outgoing and incoming traffic. Packet sniffing sensors generally use the host machine’s network card but can be configured to use monitoring ports found on some networking devices using port mirroring / forwarding in order to monitor the overall network bandwidth utilization. Netflow collectors receive data forwarded by Netflow-capable Cisco devices using the Netflow protocol.
