rinetd - 0.73-1 main

rinetd redirects TCP or UDP connections from one IP address and port to
another, with basic IP-based access control.
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rinetd is a single-process server which handles any number of connections
to the address/port pairs specified in the file /etc/rinetd.conf. Since
rinetd runs as a single process using nonblocking I/O, it is able to
redirect a large number of connections without a severe impact on the
machine. This makes it practical to run services on machines inside an IP
masquerading firewall.