


      IFCONFIG(1)                 (bsd 4.2)                 IFCONFIG(1)



      NAME
           ifconfig - configure network interface parameters

      SYNTAX
           /etc/ifconfig interface [ address ] [ parameters ]

      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.  The
           interface parameter is a string of the form ``name unit'',
           e.g. ``ec0'', while the address is either a host name
           present in the host name data base, hosts(4), 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 messages through that
                          interface.

           trailers       Enable the use of a ``trailer'' link level
                          encapsulation when sending.  If a network
                          interface supports trailers, the system will,
                          when possible, encapsulate outgoing messages
                          in a manner which attempts to minimize the
                          number of memory to memory copy operations
                          performed by the receiver.

           -trailers      Disable the use of a ``trailer'' link level
                          encapsulation (default).  Running without
                          trailers is strongly encouraged, if possible,
                          because the use of trailers slows performance
                          of the Bull-SPS9, especially when it is
                          receiving data with trailers.

           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 addresses and 10Mb/s
                          Ethernet addresses.

           -arp           Disable the use of the Address Resolution
                          Protocol.




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      IFCONFIG(1)                 (bsd 4.2)                 IFCONFIG(1)



           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 interface.

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













































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