NG_EIFACE(4)						   BSD Kernel Interfaces Manual 					      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 interface.  When eiface node is created, a new interface appears which is accessible
     via ifconfig(8).  These interfaces are named ``ngeth0'', ``ngeth1'', etc.	When a node is shut down, the corresponding interface is removed,
     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.	Similarly, packets received on the hook go to the protocol stack as packets
     received 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 available 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_SHUTDOWN con-
     trol message is required.

SEE ALSO

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