


      IIIIFFFFCCCCOOOONNNNFFFFIIIIGGGG((((1111))))                 ((((bbbbssssdddd 4444....2222))))                 IIIIFFFFCCCCOOOONNNNFFFFIIIIGGGG((((1111))))



      NNNNAAAAMMMMEEEE
           ifconfig - configure network interface parameters

      SSSSYYYYNNNNTTTTAAAAXXXX
           ////eeeettttcccc////iiiiffffccccoooonnnnffffiiiigggg interface [ _a_d_d_r_e_s_s ] [ _p_a_r_a_m_e_t_e_r_s ]

      DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
           _I_f_c_o_n_f_i_g is used to assign an address to a network interface
           and/or configure network interface parameters.  _I_f_c_o_n_f_i_g
           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
           _i_n_t_e_r_f_a_c_e 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, _h_o_s_t_s(5), or a DARPA
           Internet address expressed in the Internet standard ``dot
           notation''.

           The following parameters may be set with _i_f_c_o_n_f_i_g:

           uuuupppp             Mark an interface ``up''.

           ddddoooowwwwnnnn           Mark an interface ``down''.  When an
                          interface is marked ``down'', the system will
                          not attempt to transmit messages through that
                          interface.

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

           ----ttttrrrraaaaiiiilllleeeerrrrssss      Disable the use of a ``trailer'' link level
                          encapsulation (default).

           aaaarrrrpppp            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.

           ----aaaarrrrpppp           Disable the use of the Address Resolution
                          Protocol.

           _I_f_c_o_n_f_i_g displays the current configuration for a network
           interface when no optional parameters are supplied.

           Only the super-user may modify the configuration of a



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      IIIIFFFFCCCCOOOONNNNFFFFIIIIGGGG((((1111))))                 ((((bbbbssssdddd 4444....2222))))                 IIIIFFFFCCCCOOOONNNNFFFFIIIIGGGG((((1111))))



           network interface.

      DDDDIIIIAAAAGGGGNNNNOOOOSSSSTTTTIIIICCCCSSSS
           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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