This wiki is a community-maintained resource about everything there is to know about IPFire.
Status information about the network traffic on the red-interface is shown on the "External-Network" page. The first diagram shows the throughput of the outgoing and incoming network traffic in bytes/s.
Information about the traffic on the VPN channel is shown in the second diagram. Traffic is displayed in bytes per second.
The third diagram displays traffic on the OpenVPN channel. Traffic is displayed in bytes per second, too.