Configuring Port Forwarding behind PPPoE

[JP]

Hello,

I am currently using PPPoE on FreeBSD 5.2, I have a
need to forward internet traffic on certain ports to a
private IP address behind the box.  How can this be
accompished?

For instance, inbound traffic arriving on public IP
205.242.192.20 port 21 needs to arrive to private IP
192.168.1.1 port 21

Thanks,
JP

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