alternatives to how nnrpd starts
NNTP is generally assigned port number 119, and all news feeder and reader connections are accepted by inn. readers and feeders are determined by the originating address of the connect. If an address is determined to be a reader (or NNTP "mode reader" command is received) then inn fork()s and the child becomes an nnrpd process.
It is possible to have a separate daemon (inetd) to listen for connections on port 119, and spawn off nnrpd. This saves INN the trouble of doing it, and can be less system intensive. (INN is generally a large process in memory, which takes time to fork().)
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Copyright 1997-1998, Forrest J. Cavalier III, Mib Software, INN customization and consulting