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.Dd October 25, 1994 .Dt YPBIND 8 .Os .Sh NAME .Nm ypbind .Nd create and maintain a binding to a YP server .Sh SYNOPSIS .Nm ypbind .Op Fl ypset .Nm ypbind .Op Fl ypsetme .Nm ypbind .Op Fl broadcast .Sh DESCRIPTION .Nm finds the server for a particular YP domain and stores information about it in a
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
a /var/yp/binding in a file named with the convention
a domainname.version. (The YP system only supplies information on version 2.)
p If .Nm is started without the .Fl broadcast option, .Nm steps through the list of YP servers specified in
a /var/yp/domainname/.ypservers and contacts each in turn attempting to bind to that server. It is strongly recommended that these hosts are in the local hosts file, and that hosts are looked up in local files before the YP hosts map.
p If .Nm is started with the .Fl broadcast option, or if
a /var/yp/domainname/.ypservers does not exist, .Nm broadcasts to find a process willing to serve maps for the client's domain.
p Once a binding is established, .Nm 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, .Nm marks the domain as unbound and attempts to re-establish the binding. When the binding is once again successful, .Nm marks the domain as bound and resumes its periodic check.
p The options are as follows: l -tag -width "-broadcast" t Fl ypset .Xr ypset 8 may be used to change the server to which a domain is bound. t Fl ypsetme .Xr ypset 8 may be used only from this machine to change the server to which a domain is bound. t Fl broadcast sends a broadcast requesting a YP server to which to bind. .El
p The .Fl ypset , .Fl ypsetme , and .Fl broadcast options are inherently insecure and should be avoided. .Sh FILES
a /var/yp/bindings/domainname.version - binding file for domainname
a /var/yp/domainname/.ypservers - explicit servers to bind to. .Sh SEE ALSO .Xr domainname 1 , .Xr ypcat 1 , .Xr ypmatch 1 , .Xr yppoll 8 , .Xr ypset 8 , .Xr ypwhich 1 , .Xr yp 8 .Sh AUTHOR This version of .Nm ypbind was originally implemented by Theo de Raadt. The .ypservers support was implemented by Luke Mewburn.