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.

Debian                                           March 25, 2007                                          EDSC(4)