Интерактивная система просмотра системных руководств (man-ов)
edsc (4)
>> edsc (4) ( FreeBSD man: Специальные файлы /dev/* )
BSD mandoc
NAME
edsc
- Ethernet discard network interface
SYNOPSIS
device edsc
DESCRIPTION
The
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_bridge4
and
vlan(4).
As with other network interfaces, an
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
SIOCSIFADDRioctl(2)
or
ifconfig(8)
utility.
Each
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.conf5.
The
device was derived from the
disc(4)
device and first appeared in
Fx 6.3 .
This manpage was adapted from
disc(4).
CAVEATS
Since outgoing packets are just discarded by
,
ARP requests stay unreplied.
Consequently, an IP packet cannot be sent via
until a static
arp(4)
entry is created for its next hop using
arp(8).
Initially an
interface has a zero link level address.
It can be changed with
ifconfig(8)
lladdr
if needed.
