In order to run ypset, ypbind must be initiated with the -ypset or -ypsetme options. See ypbind(8).
ypset tells ypbind to get NIS services for the specified domain from the ypserv(8) process running on
server.
In cases where several hosts on the local net are supplying NIS services, it is possible for ypbind to
rebind to another host even while you attempt to find out if the ypset operation succeeded. For example,
you can type:
example%ypsethost1example%ypwhichhost2
which can be confusing. This is a function of the NIS subsystem's attempt to know always a running NIS
server, and occurs when host1 does not respond to ypbind because it is not running ypserv (or is
overloaded), and host2, running ypserv, gets the binding.
Server indicates the NIS server to bind to, and must be specified as a name or an IP address. This will
work only if the node has a current valid binding for the domain in question, and ypbind has been set to
allow use of ypset. In most cases, server should be specified as an IP address.