Operating principles

Accounting users are identified by their user name. Potential accounting users are:

All stations on the LAN (user name is their IPv4 or IPv6 address, or if known to the router via DNS, the station's hostname)
All VPN peers (user name is the peer name)
All dialed-in RAS clients (user name is the RAS client ID; multiple dial-ins are mapped to the same ID)

The data traffic counted by accounting is any data traffic that takes place between a user and an IP address behind one of the following interface types (regardless of whether Rx or Tx traffic):

When connecting VPN to VPN, for example, the traffic is counted and booked separately for both VPN users.

The accounting records the data traffic with each remote site separately for each user. What this means is: Traffic, for example, from VPN to WAN1 and traffic from VPN to WAN2 are separate records.

From the user's point of view, the accounting records incoming and outgoing data as well as IPv4 and IPv6 traffic separately. This means that an IPv6 data packet from VPN1 to VPN2 is counted as IPv6-Tx for VPN1, and as IPv6-Rx for VPN2.

Also, the accounting records the number of data streams (sessions) that have occurred, but not separately according to Rx and Tx.

Bidirectional traffic is counted as 2 sessions because there are 2 streams. One incoming and one outgoing data stream from the user's point of view.