Is there a link to a tutorial on how to interpret graph data? I seem to have Rx and Tx activity even when all computers have been off overnight. Also, is WAN (vlan1) what would report overall data activity when one is concerned with bandwidth caps with ISP? I can sit there in real time, with all my network devices disconnected from the network/internet, except for the one I am using to log into my router and look at the real time, and it still shows Rx and Tx activity. Maybe I am not understanding the graph correctly.