CANLOOP(4) Device Drivers Manual CANLOOP(4)

canloop
software loopback CAN network interface

pseudo-device canloop

The canloop pseudo interface is a loopback interface for the CAN layer. It can be used as destination by a CAN application, when no CAN hardware is available. Other sockets bound to the same canloop interface (or not bound to any interface) will receive the frames.

canloop interfaces can be created by using the ifconfig(8) create command.

can(4), intro(4), ifconfig(8)

The canloop device appeared in NetBSD 8.0.
May 18, 2017 NetBSD 9.4