# 2.11BSD#431 - /usr/man/cat8/ifconfig.0

    IFCONFIG(8)	    UNIX Programmer's Manual	      IFCONFIG(8)

    NAME
         ifconfig - configure network interface parameters

    SYOPNSIS
         /sbin/ifconfig interface address_family [ address [
         dest_address ] ] [ parameters ]
         /sbin/ifconfig interface [ protocol_family ]

    DESCRIPTION
         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 or other
         operating parameters.  The interface parameter is a string
         of the form ``name unit'', e.g. ``en0''.

         Since an interface may receive transmissions in differing
         protocols, each of which may require separate naming
         schemes, it is necessary to specify the address_family,
         which may change the interpretation of the remaining parame-
         ters.  The address families currently supported are ``inet''
         and ``ns''.

         For the DARPA-Internet family, 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''.	For the Xerox Network Systems(tm) family,
         addresses are net:a.b.c.d.e.f, where net is the assigned
         network number (in decimal), and each of the six bytes of
         the host number, a through f, are specified in hexadecimal.
         The host number may be omitted on 10Mb/s Ethernet inter-
         faces, which use the hardware physical address, and on
         interfaces other than the first.

         The following parameters may be set with ifconfig:

         up             Mark an interface ``up''. This may be used to
    		    enable an interface after an ``ifconfig
    		    down.'' It happens automatically when setting
    		    the first address on an interface.	If the
    		    interface was reset when previously marked
    		    down, the hardware will be re-initialized.

         down	    Mark an interface ``down''.  When an inter-
    		    face is marked ``down'', the system will not
    		    attempt to transmit messages through that
    		    interface. If possible, the interface will be
    		    reset to disable reception as well.  This
    		    action does not automatically disable routes
    		    using the interface.

    Printed 11/24/99	November 16, 1996			1

    IFCONFIG(8)	    UNIX Programmer's Manual	      IFCONFIG(8)

         trailers	    Request the use of a ``trailer'' link level
    		    encapsulation when sending (default).  If a
    		    network interface supports trailers, the sys-
    		    tem will, when possible, encapsulate outgoing
    		    messages in a manner which minimizes the
    		    number of memory to memory copy operations
    		    performed by the receiver.	On networks that
    		    support the Address Resolution Protocol (see
    		    arp(4P); currently, only 10 Mb/s Ethernet),
    		    this flag indicates that the system should
    		    request that other systems use trailers when
    		    sending to this host.  Similarly, trailer
    		    encapsulations will be sent to other hosts
    		    that have made such requests.  Currently used
    		    by Internet protocols only.

         -trailers	    Disable the use of a ``trailer'' link level
    		    encapsulation.

         arp	    Enable the use of the Address Resolution Pro-
    		    tocol in mapping between network level
    		    addresses and link level addresses (default).
    		    This is currently implemented for mapping
    		    between DARPA Internet addresses and 10Mb/s
    		    Ethernet addresses.

         -arp	    Disable the use of the Address Resolution
    		    Protocol.

         metric n	    Set the routing metric of the interface to n,
    		    default 0.	The routing metric is used by the
    		    routing protocol (routed(8)).  Higher metrics
    		    have the effect of making a route less favor-
    		    able; metrics are counted as addition hops to
    		    the destination network or host.

         debug	    Enable driver dependent debugging code; usu-
    		    ally, this turns on extra console error log-
    		    ging.

         -debug	    Disable driver dependent debugging code.

         netmask mask   (Inet only) Specify how much of the address
    		    to reserve for subdividing networks into
    		    sub-networks.  The mask includes the network
    		    part of the local address and the subnet
    		    part, which is taken from the host field of
    		    the address.  The mask can be specified as a
    		    single hexadecimal number with a leading 0x,
    		    with a dot-notation Internet address, or with
    		    a pseudo-network name listed in the network
    		    table networks(5).	The mask contains 1's for

    Printed 11/24/99	November 16, 1996			2

    IFCONFIG(8)	    UNIX Programmer's Manual	      IFCONFIG(8)

    		    the bit positions in the 32-bit address which
    		    are to be used for the network and subnet
    		    parts, and 0's for the host part.  The mask
    		    should contain at least the standard network
    		    portion, and the subnet field should be con-
    		    tiguous with the network portion.

         dstaddr	    Specify the address of the correspondent on
    		    the other end of a point to point link.

         broadcast	    (Inet only) Specify the address to use to
    		    represent broadcasts to the network.  The
    		    default broadcast address is the address with
    		    a host part of all 1's.

         ipdst	    (NS only) This is used to specify an Internet
    		    host who is willing to receive ip packets
    		    encapsulating NS packets bound for a remote
    		    network.  In this case, an apparent point to
    		    point link is constructed, and the address
    		    specified will be taken as the NS address and
    		    network of the destinee.

         Ifconfig displays the current configuration for a network
         interface when no optional parameters are supplied.  If a
         protocol family is specified, Ifconfig will report only the
         details specific to that protocol family.

         Only the super-user may modify the configuration of a net-
         work interface.

    DIAGNOSTICS
         Messages indicating the specified interface does not exit,
         the requested address is unknown, or the user is not
         privileged and tried to alter an interface's configuration.

    SEE ALSO
         netstat(1), intro(4N), rc(8)

    Printed 11/24/99	November 16, 1996			3

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