PRTG全称为Paessler Router Traffic Grapher，是一款功能强大的免费且可以通过路由器等设备上的SNMP协议取得流量资讯并产生图形报

PRTG is a full-featured Paessler Router Traffic Grapher, a powerful free software that can obtain traffic information and generate graphical reports via SNMP protocol on devices such as routers.