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    Command:

    rpc.ypxfrd

    
    
    

    SYNOPSIS

           /usr/sbin/rpc.ypxfrd [ -d path ] [ -p port ] [ --debug ]
           /usr/sbin/rpc.ypxfrd --version
    
    
    

    DESCRIPTION

           rpc.ypxfrd  is  used  for  speed up the transfer of very large NIS maps
           from a NIS master to the NIS slave  server.  If  a   NIS  slave  server
           receives  a  message  that  there is a new map, it will start ypxfr for
           transfering the new map.  ypxfr will read the contents of  a  map  from
           the  master  server  using the yp_all() function. This process can take
           several minutes when there are very large maps which have to be  stored
           by the database library.
    
           The  rpc.ypxfrd  server  speeds up the transfer process by allowing NIS
           slave servers to simply copy the master server's map files rather  than
           building  their  own  from  scratch.  rpc.ypxfrd uses an RPC-based file
           transfer protocol, so that there is no need for building a new map.
    
           rpc.ypxfrd could be started by inetd. But since it starts very  slowly,
           it should be started after ypserv from /etc/init.d/ypxfrd.
    
    
    

    OPTIONS

           --debug
                  Causes  the  server to run in debugging mode. In debug mode, the
                  server does not background itself and prints extra  status  mes-
                  sages to stderr for each request that it revceives.
    
           -d directory
                  rpc.ypxfrd is using this directory instead of /var/yp
    
           -p port
                  rpc.ypxfrd  will bind itself to this port, which makes it possi-
                  ble to have a router filter packets to the NIS ports.  This  can
                  restricted the access to the NIS server from hosts on the Inter-
                  net.
    
           --version
                  Prints the version number
    
    
    

    SECURITY

           rpc.ypxfrd uses the same functions for checking a host as  ypserv.   At
           first,   rpc.ypxfrd   will   check  a  request  from  an  address  with
           /etc/ypserv.securenets.  If the host  is  allowed  to  connect  to  the
           server,  rpc.ypxfrd  will uses the rules from /etc/ypserv.conf to check
           the requested map. If a mapname doesn't match a rule,  rpc.ypxfrd  will
           look  for  the  YP_SECURE key in the map. If it exists, rpc.ypxfrd will
           only allow requests on a reserved port.
    
    
    

    FILES

           /etc/ypserv.conf /var/yp/securenets
    
           checks, if both, master and slave, uses the same database packages and,
           if necessary, the byte order of the system.
    
    
    

    AUTHOR

           ypxfrd    protocol    and    FreeBSD    Implementation:    Bill    Paul
           <wpaul@ctr.columbia.edu>
           Linux Implementation: Thorsten Kukuk <kukuk@suse.de>
    
    
    

    YP Server August 2001 RPC.YPXFRD(8)

    
    
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