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portmap




DESCRIPTION

     Portmap is a server that converts RPC program numbers into DARPA protocol
     port numbers.  It must be running in order to make RPC calls.

     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.

     Portmap must be started before any RPC servers are invoked.

     Normally portmap forks and dissociates itself from the terminal like any
     other daemon.  Portmap then logs errors using syslog(3).

     Option available:

     -d      (debug) prevents portmap from running as a daemon, and causes
             errors and debugging information to be printed to the standard
             error output.

     -v      (verbose) causes portmap to give more logging information to
             syslogd(8.)


Access control

     By default, host access control is enabled. However, the host that runs
     the portmapper is always considered authorized. The host access control
     tables are never consulted with requests from the local system itself;
     they are always consulted with requests from other hosts.

     In order to avoid deadlocks, the portmap program does not attempt to look
     up the remote host name or user name, nor will it try to match NIS net­
     groups. The upshot of all this is that only network number patterns will
     work for portmap access control.

     Sample entries for the host access-control files are:

     /etc/hosts.allow:
             portmap: your.sub.net.number/your.sub.net.mask
             portmap: 255.255.255.255 0.0.0.0

     /etc/hosts.deny
             portmap: ALL

     The syntax of the access-control files is described in the
     hosts_access(5) and hosts_options(5) manual page that comes with the tcp
     wrapper (log_tcp) sources.  The safe_finger command comes with later
     wrapper releases.

     The first line in the hosts.allow file permits access from all systems
     within your own subnet. Some rpc services rely on broadcasts and will


BUGS

     If portmap crashes, all servers must be restarted.


HISTORY

     The portmap command appeared in 4.3BSD

4.3 Berkeley Distribution       March 16, 1991       4.3 Berkeley Distribution
  
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