Robuta

https://www.netscout.com/what-is/sniffer
Packet sniffing is a technique whereby packet data flowing across the network is detected and observed. Network administrators use packet sniffing tools to...
packet sniffingnetscout
https://www.olimex.com/forum/index.php?topic=7067.0;prev_next=prev
packet sniffing
https://www.paessler.com/manuals/prtg/monitoring_bandwidth_via_packet_sniffing
packet sniffingprtg manualmonitoringbandwidthvia