DISC(4) BSD Kernel Interfaces Manual DISC(4)
disc -- software discard network interface
The disc interface is a software discard mechanism which may be used for
performance analysis and/or software testing. As with other network
interfaces, the discard interface must have network addresses assigned
for each address family with which it is to be used. These addresses may
be set or changed with the SIOCSIFADDR ioctl(2).
Each disc interface is created at runtime using interface cloning. This
is most easily done with the ifconfig(8) create command or using the
cloned_interfaces variable in rc.conf(5).
The disc device appears to have been derived from the lo(4) device around
the time of 4.4BSD. This manpage was adapted from lo(4) and first
appeared in FreeBSD 5.0.
BSD May 25, 2002 BSD