07-15-2005
As always I am a bit lost here.
Port starts from 0 (or 1 I don't remember) all the way up to 32555 (or sth similar). A port allocated by an active process (either serve or client) can be found by netstat. Everything else is not being used and so "available" for a process to allocate.
/etc/services is a differenet thing which may have implication for inetd or xinetd only. A port does not have to be "registered" in this file to be used by a process which has nothing to do with inetd.
There are more than one approaches to block a port. Conventional approach is via tcpwrapper. Now, people are more likely using (soft- or hardware based) firewall such as iptables in Linux.
I hope it answered all of your questions.
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HUNTD(6) BSD Games Manual HUNTD(6)
NAME
huntd -- hunt daemon, back-end for hunt game
SYNOPSIS
huntd [-s] [-p port]
DESCRIPTION
huntd controls the multi-player hunt(6) game. When it starts up, it tries to notify all members of the hunt-players mailing list (see
sendmail(8)) by faking a talk(1) request from user ``Hunt Game''.
The -s option is for running huntd forever (server mode). This is similar to running it under the control of inetd(8) (see below), but it
consumes a process table entry when no one is playing.
The -p option changes the UDP port number used to rendezvous with the player process and thus allows for private games of hunt. This option
turns off the notification of players on the hunt-players mailing list.
INETD
To run huntd from inetd(8), you'll need to uncomment the following line in /etc/inetd.conf:
hunt dgram udp wait nobody /usr/games/huntd huntd
Do not use any of the command line options; if you want inetd(8) to start up huntd on a private port, change the port listed for hunt in
/etc/services.
NETWORK RENDEZVOUS
When hunt(6) starts up, it broadcasts on the local area net (using the broadcast address for each interface) to find a hunt game in progress.
If a huntd hears the request, it sends back the port number for the hunt process to connect to. Otherwise, the hunt process starts up a
huntd on the local machine and tries to rendezvous with it.
SEE ALSO
talk(1), hunt(6), sendmail(8)
AUTHORS
Conrad Huang, Ken Arnold, and Greg Couch;
University of California, San Francisco, Computer Graphics Lab
BSD
April 4, 2001 BSD