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NAME    [Toc]    [Back]

       rpc.ypxfrd - NIS map transfer server

SYNOPSIS    [Toc]    [Back]

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

DESCRIPTION    [Toc]    [Back]

       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 store 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 slow, it
       should be started after ypserv from /etc/init.d/ypxfrd.

OPTIONS    [Toc]    [Back]

	      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

SECURITY    [Toc]    [Back]

       rpc.ypxfrd uses the same functions for checking a host then 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.

FILES    [Toc]    [Back]

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

SEE ALSO    [Toc]    [Back]

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

BUGS    [Toc]    [Back]

       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 package 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 protocol
       checks, if both, master and slave, uses the same database packages and,
       if necessary, the byte order of the system.

AUTHOR    [Toc]    [Back]

       ypxfrd	 protocol    and    FreeBSD    Implementation:	  Bill	  Paul

       Linux Implementation: Thorsten Kukuk <kukuk@suse.de>

NYS YP Server			  August 1996			 RPC.YPXFRD(8)
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