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

NAME

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

SYNOPSIS

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

DESCRIPTION

     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 direc-
     tory /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/ (ie. /etc/yp/DOMAINNAME).  If such a file exists, it will list the hosts which ypbind should restrict it's 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 periodi-
     cally 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:

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

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

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

     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 recommended.  The file should contain a list of valid YP server hostnames, with one hostname per line.	The comment character is #.

     If the directory /var/yp/binding exists, YP is started automatically at boot time by /etc/rc.

FILES

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

SEE ALSO

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

AUTHOR

     Theo de Raadt

BSD
								 October 25, 1994							       BSD