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YPBIND(8)		FreeBSD	System Manager's Manual		     YPBIND(8)

     ypbind -- create and maintain a binding to	a YP server

     ypbind [-insecure]	[-ypset] [-ypsetme]

     ypbind finds the server for a particular YP domain	and stores information
     about it in a "binding file".  This binding information includes the IP
     address of	the server associated with that	particular domain and which
     port the server is	using.	This information is stored in the directory
     /var/yp/binding in	a file named with the convention DOMAINNAME.version.
     (The YP system only supplies information on version 2.)

     When ypbind starts	the primary domain (or gets the	first request for a
     new domain), it checks if a file for the domain in	question exists	in the
     directory /etc/yp/	(i.e., /etc/yp/DOMAINNAME).  If	such a file exists, it
     will list the hosts which ypbind should restrict its server search	to.
     Otherwise,	ypbind assumes it will need to use broadcasts to find a	valid
     server.  Using either of these techniques,	ypbind will search for a
     server willing to serve maps for the client's domain.  Once a binding is
     established, ypbind maintains this	binding	by periodically	communicating
     with the server to	which it is bound.  If the binding is somehow lost,
     e.g by server reboot, ypbind marks	the domain as unbound and attempts to
     re-establish the binding.	When the binding is once again successful,
     ypbind marks the domain as	bound and resumes its periodic check.

     The options are as	follows:

	     Permit binding to a ypserv(8) on a	non-reserved port.  This is
	     needed if receiving maps from SunOS 3.x or	Ultrix.

     -ypset  ypset(8) may be used to change the	server to which	a domain is

	     ypset(8) may be used only from this machine to change the server
	     to	which a	domain is bound.

     The -ypset	and -ypsetme options are dangerous and should be avoided.  For
     greatest security,	the use	of a server list in /etc/yp/DOMAINNAME is rec-
     ommended.	The file should	contain	a list of valid	YP server hostnames,
     with one hostname per line.  The comment character	is #.

     /var/yp/binding/DOMAINNAME.version	- binding file for domainname
     /etc/yp/DOMAINNAME	- server list for this particular domain

     domainname(1), ypcat(1), ypmatch(1), ypwhich(1), yp(8), yppoll(8),
     ypserv(8),	ypset(8)

     Once ypbind is running, the following pages should	be reviewed in order
     to	see how	to enable YP support for each of the following maps:
     ethers(5),	group(5), hosts(5), passwd(5), resolv.conf(5)

     Theo de Raadt

FreeBSD	13.0			April 26, 2018			  FreeBSD 13.0


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