my test ruleset






    match in log proto tcp to port 2020 rdr-to 127.0.0.5
    match in log proto tcp to port 2020 rdr-to 127.0.0.4
    match in log proto tcp to port 2020 rdr-to 127.0.0.3
    match in log proto tcp to port 2020 rdr-to 127.0.0.2
    pass  in log proto tcp to port 2020 rdr-to 127.0.0.1 port 22