| EDSC(4) | Device Drivers Manual | EDSC(4) |
edsc — Ethernet
discard network interface
device edsc
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).
ioctl(2), arp(4), if_bridge(4), inet(4), intro(4), vlan(4), rc.conf(5), arp(8), ifconfig(8)
The edsc device was derived from the
disc(4) device and first appeared in
FreeBSD 6.3. This manpage was adapted from
disc(4).
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.
| March 25, 2007 | Debian |