 

 , ,        
,   :

:::

     IP-   NIS,    ,
    ,    ,  
   none (  ), port (  
 )  deny (  ).

     ypserv. conf,   Red Hat:

$ cat /etc/ypserv.conf

* Not everybody should see the shadow passwords, not secure, since
t under MSDOG everbody is root and can access ports < 1024 !!!

(     ,   ,  
 MSDOG    root      < 1024 !!!)

*                          : *       : shadow.byname    : port

*                          : *       : passwd.adjunct.byname : port

      shadow, byname  passwd. adjunct, byname
(    () )     -
,  1024. ,    ,   DOS  -
  Windows     ,     
   ,  1024.

    LAN  ,     -
   NIS,      , -  
  -   ,    
  NIS.    IP,     ,
    ypserv. conf.  ,   
IP-,    NIS  .    
ypserv. conf    ,   IP-  
192.168.0.1-192.168.0.255 (  192.168.0.1    /24 (. -
 " "  " "  11)):

$ cat /etc/ypserv.conf

192.168.0.1/24 : * : * : none

  /var/yp/securenets

      /var/yp/securenets, 
    RPC- NIS-  
 NIS.  ,   securenets   -
   shadow,   .  
securenets   , NIS-     .

   securenets     IP-. NIS  -
  , IP-        securenets,  -
      . ()    -
  securenets  localhost (127.0.0.1).     securenets:

 21. NIS:                                    667