ng_eiface(4)

NAME

ng_eiface - generic Ethernet interface netgraph node type

SYNOPSIS

#include <netgraph/ng_eiface.h>

DESCRIPTION

The eiface netgraph node implements the generic Ethernet in

terface. When
eiface node is created, a new interface appears which is ac

cessible via
ifconfig(8). These interfaces are named ``ngeth0'',

``ngeth1'', etc.
When a node is shut down, the corresponding interface is re

moved, and the
interface name becomes available for reuse by future eiface

nodes. New
nodes always take the first unused interface.

HOOKS

An eiface node has a single hook named ether, which should

be connected
to the Ethernet downstream, for example, to the ng_vlan(4)

node. Packets
transmitted via the interface flow out this hook. Similar

ly, packets
received on the hook go to the protocol stack as packets re

ceived by any
real Ethernet interface.

CONTROL MESSAGES

This node type supports the generic control messages, plus

the following:

NGM_EIFACE_SET (set)

Set link-level address of the interface. Requires

struct
ether_addr as an argument. This message also has an

ASCII version, called ``set'', which requires as an argument

an ASCII
string consisting of 6 colon-separated hex digits.

NGM_EIFACE_GET_IFNAME (getifname)

Return the name of the associated interface as a

NUL-terminated
ASCII string.

NGM_EIFACE_GET_IFADDRS

Return the list of link-level addresses associated

with the node.

SHUTDOWN

This node shuts down upon receipt of a NGM_SHUTDOWN control

message. The
associated interface is removed and its name becomes avail

able for reuse
by future eiface nodes.

Unlike most other node types, an eiface node does not go

away when all
hooks have been disconnected; rather, and explicit NGM_SHUT

DOWN control
message is required.

SEE ALSO

netgraph(4), ng_ether(4), ng_iface(4), ng_vlan(4), ifcon

fig(8), ngctl(8)

HISTORY

The eiface node type was implemented in FreeBSD 4.6.

AUTHORS

The eiface node type was written by Vitaly V Belekhov. This

manual page
was written by Gleb Smirnoff.

BSD February 3, 2005

BSD