redir - 3.3-1 main

It can run under inetd or stand alone (in which case it handles multiple
connections). It is 8 bit clean, not limited to line mode, is small and
light. Supports transparency, FTP redirects, http proxying, NAT and bandwidth
limiting.
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redir is all you need to redirect traffic across firewalls that authenticate
based on an IP address etc. No need for the firewall toolkit. The
functionality of inetd/tcpd and "redir" will allow you to do everything you
need without screwy telnet/ftp etc gateways. (I assume you are running IP
Masquerading of course.)