To run any of the software mentioned below you will need to run the
program /usr/sbin/portmap. Some Linux distributions already have
the code in the /sbin/init.d/ or /etc/rc.d/ files to start up this
daemon. All you have to do is to activate it and reboot your Linux
machine. Read your Linux Distribution Documentation how to do this.
The RPC portmapper (portmap(8)) is a server that converts RPC program
numbers into TCP/IP (or UDP/IP) protocol port numbers. It must be
running in order to make RPC calls (which is what the NIS/NIS+ client
software does) to RPC servers (like a NIS or NIS+ server) on that machine.
When an RPC server is started, it will tell portmap what port number it
is listening to, and what RPC program numbers it is prepared to serve.
When a client wishes to make an RPC call to a given program number, it
will first contact portmap on the server machine to determine the port
number where RPC packets should be sent.
Since RPC servers could be started by inetd(8), portmap should
be running before inetd is started.
For secure RPC, the portmapper needs the Time service. Make sure, that the
Time service is enabled in /etc/inetd.conf on all hosts:
#
# Time service is used for clock syncronization.
#
time stream tcp nowait root internal
time dgram udp wait root internal |
IMPORTANT: Don't forget to restart inetd after changes on its
configuration file !
