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PORTMAP(8) BSD System Manager's Manual PORTMAP(8)
portmap -- DARPA port to RPC program number mapper
portmap [-d] [-v]
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).
-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) run portmap in verbose mode.
This portmap version is protected by the tcp_wrapper library. You have to give the clients
access to portmap if they should be allowed to use it. To allow connects from clients of the
.bar.com domain you could use the following line in /etc/hosts.allow:
You have to use the daemon name portmap for the daemon name (even if the binary has a dif-
ferent name). For the client names you can use the keyword ALL, IP addresses, hostnames or
For further information please have a look at the tcpd((8)), hosts_allow((5)) and
hosts_access((5)) manual pages.
xinetd.conf((5)), rpcinfo((8)), pmap_set((8)), pmap_dump((8)), xinetd((8)) tcpd((8))
If portmap crashes, all rpc servers must be restarted.
The portmap command appeared in BSDBSD 4.3.
4.3 Berkeley Distribution March 16, 1991 4.3 Berkeley Distribution
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