portfwd is a small user-level daemon which
forwards incoming TCP connections and/or UDP
packets to remote hosts. Multiple forwarders can
be specified in a flexible configuration file.
There is support for FTP forwarding and
transparent proxy.
Information regarding Project Releases and Project Resources. Note that the information here is a quote from Freecode.com page, and the downloads themselves may not be hosted on OSDN.
This release adds the ability to invoke an external program to select the destination based on the address and port of incoming connections or datagrams.
An option to prevent the daemon from forking into background has been added, multiple destinations can now be configured in order to provide simple round-robin load-balancing, and it's possible to specify the source address used for outgoing connections/datagrams.