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EDSC(4FREEBSD) - Linux man page online | Special files

Ethernet discard network interface.

Chapter
March 25, 2007
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
This manual Reference Other manuals
edsc(4freebsd) referred by if_edsc(4freebsd)
refer to arp(4freebsd) | arp(8) | disc(4freebsd) | if_bridge(4freebsd) | ifconfig(8) | inet(4freebsd) | intro(4) | ioctl(2) | vlan(4freebsd)
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