disc(4) [freebsd man page]

DISC(4) 						   BSD Kernel Interfaces Manual 						   DISC(4)

NAME

     disc -- software discard network interface

SYNOPSIS

     device disc

DESCRIPTION

     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).

SEE ALSO

     inet(4), intro(4)

HISTORY

     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

EDSC(4) 						   BSD Kernel Interfaces Manual 						   EDSC(4)

NAME

     edsc -- Ethernet discard network interface

SYNOPSIS

     device edsc

DESCRIPTION

     The edsc interface is a software discard mechanism which may be used for performance analysis and software testing.  It imitates an Ethernet
     device, which allows for its use in conjunction with such drivers as if_bridge(4) and vlan(4).

     As with other network interfaces, an edsc 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) or ifconfig(8) utility.

     Each edsc 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).

SEE ALSO

     ioctl(2), arp(4), if_bridge(4), inet(4), intro(4), vlan(4), rc.conf(5), arp(8), ifconfig(8)

HISTORY

     The edsc device was derived from the disc(4) device and first appeared in FreeBSD 6.3.  This manpage was adapted from disc(4).

CAVEATS

     Since outgoing packets are just discarded by edsc, ARP requests stay unreplied.  Consequently, an IP packet cannot be sent via edsc until a
     static arp(4) entry is created for its next hop using arp(8).

     Initially an edsc interface has a zero link level address.  It can be changed with ifconfig(8) lladdr if needed.

BSD
								  March 25, 2007							       BSD