ifconfig - configure network interface parameters
/etc/ifconfig interface [ address ] [ parameters ]
Ifconfig is used to assign an address to a network interface and/or
configure network interface parameters. Ifconfig must be used at boot
time to define the network address of each interface present on a
machine; it may also be used at a later time to redefine an interface's
address. The interface parameter is a string of the form ``name
unit'', e.g. ``en0'', while the address is either a host name present
in the host name data base, hosts(5), or a DARPA Internet address
expressed in the Internet standard ``dot notation''.
The following parameters may be set with ifconfig:
up Mark an interface ``up''.
down Mark an interface ``down''. When an interface is marked
``down'', the system will not attempt to transmit mes-
sages through that interface.
trailers Enable the use of a ``trailer'' link level encapsulation
when sending (default). If a network interface supports
trailers, the system will, when possible, encapsulate
outgoing messages in a manner which minimizes the number
of memory to memory copy operations performed by the
-trailers Disable the use of a ``trailer'' link level encapsula-
arp Enable the use of the Address Resolution Protocol in
mapping between network level addresses and link level
addresses (default). This is currently implemented for
mapping between DARPA Internet addreses and 10Mb/s Eth-
-arp Disable the use of the Address Resolution Protocol.
Ifconfig displays the current configuration for a network interface
when no optional parameters are supplied.
Only the super-user may modify the configuration of a network inter-
Messages indicating the specified interface does not exit, the
requested address is unknown, the user is not privileged and tried to
alter an interface's configuration.
rc(8), intro(4N), netstat(1)
4th Berkeley Distribution 28 August 1983 IFCONFIG(8C)