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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 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 /var/yp/binding (ie. /var/yp/binding/DOMAIN-NAME.ypservers). /var/yp/binding/DOMAINNAME.ypservers).
     NAME.ypservers).  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:

     -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.

     -d        enable debugging output.

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

FILES
     /var/yp/binding/DOMAINNAME.version - binding file for domainname /var/yp/binding/DOMAINNAME.ypservers -server /var/yp/binding/DOMAINNAME.ypserversserver
     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