IF_EDSC(4FREEBSD) - man page online | special files

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 analy‐
     sis and software testing.  It imitates an Ethernet device, which allows for its use in con‐
     junction 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.  Conse‐
     quently, 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