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RPC.YPXFRD(8)				 Reference Manual			    RPC.YPXFRD(8)

       rpc.ypxfrd - NIS map transfer server

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

       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 sim-
       ply 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.

	      Causes  the  server  to  run  in debugging mode. In debug mode, the server does not
	      background itself and prints extra status messages 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 possible to have a router
	      filter packets to the NIS ports. This can restricted the access to the  NIS  server
	      from hosts on the Internet.

	      Prints the version number

       rpc.ypxfrd  uses  the  same functions for checking a host as ypserv.  At first, rpc.ypxfrd
       will check a request from an address with /var/yp/securenets or the tcp wrapper.   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.

       /etc/ypserv.conf /var/yp/securenets

       ypserv(8), makedbm(8), yppush(8), ypxfr(8)

       The FreeBSD ypxfrd protocol is not compatible with that used by SunOS. This is unfortunate
       but  unavoidable:  Sun's  protocol  is  not freely available, and even if it were it would
       probably not be useful since the SunOS NIS v2 implimentation uses the original ndbm  pack-
       age  for  its  map databases whereas the other implimentation uses GNU DBM or Berkeley DB.
       These packages uses vastly different file formats. Furthermore, ndbm and  gdbm  are  byte-
       order  sensitive and not very smart about it, meaning that a gdbm or ndbm database created
       on a big endian system can't be read on a little endian system. The FreeBSD ypxfrd  proto-
       col  checks, if both, master and slave, uses the same database packages and, if necessary,
       the byte order of the system.

       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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