EDSC(4) | Device Drivers Manual | EDSC(4) |
NAME¶
edsc
—
SYNOPSIS¶
device edsc
DESCRIPTION¶
Theedsc
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¶
Theedsc
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 byedsc
, 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.
March 25, 2007 | Linux 4.9.0-9-amd64 |