rinetd - 0.62.1sam-1.1 main

rinetd redirects TCP connections from one IP address and port to another,
with basic IP-based access control.
.
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.