ifconfig(1M)                                         ifconfig(1M)



     NAME
          ifconfig - configure network interface parameters

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

     DESCRIPTION
          ifconfig assigns an address to a network interface and
          configures network interface parameters.  You must use
          ifconfig at boot time to define the network address of each
          interface on a machine; you may also use it later to
          redefine an interface's address.

          interface   a string of the form name unit, e.g., en0.

          address     either a host name present in the host name data
                      base, hosts(4N), or a DARPA Internet address
                      expressed in the Internet standard dot notation.

          parameters

                      up         Mark an interface up.

                      down       Mark an interface down.  The system
                                 will not try to transmit messages
                                 through an interface marked down.

                      trailers       Enable ``trailer'' link level
                                     encapsulation when sending
                                     (default).  If a network
                                     interface supports trailers, the
                                     system will, when possible,
                                     encapsulate outgoing messages to
                                     minimize the number of memory-
                                     to-memory copy operations the
                                     receiver performs.

                      -trailers      Disable ``trailer'' link level
                                     encapsulation.

                      arp            Enable the Address Resolution
                                     Protocol to map 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 Address Resolution
                                     Protocol.

          If you don't supply any parameters, ifconfig displays the



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     ifconfig(1M)                                         ifconfig(1M)



          current configuration for a network interface.

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

     DIAGNOSTICS
          Messages indicating that the specified interface does not
          exit, the requested address is unknown, and someone other
          than the super-user tried to alter an interface's
          configuration.

     FILES
          /etc/ifconfig

     SEE ALSO
          netstat(1N), intro(5N).







































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