It is probably a good idea to troubleshoot these disparate issues independently from one another.
If your goal is to run a telnet BBS on an emulator, you are going to need the following.
- Port forwarding from the public IP to the IP of the computer that is hosting the Amiga Emulator.
- Most Amiga BBS software requires a "device" to function like "telnetd.device". Newer versions of WinUAE offer ethernet card emulation which you will need to enable and configure with an Amiga TCP/IP stack to allow this device to work.
- You will need a program such as WinPcap to send the TCP/IP traffic from the host OS over to the Amiga OS through windows.
- I don't think EUA or the the Mac OS have the necessary combination of magic to allow you to run bbs under emulation but I would be more than happy to be proven wrong on this assumption.
- Trying to get this working on parallels is going to add another layer of complexity (as previously mentioned) because of the way IP traffic is handled through parallels (Bridge or NAT.) In short, you are making this several orders of magnitude more difficult than it already is by doing this. If you have boot camp, get it working from there instead / first.
So the first thing you should be concerned with is getting port 23 to pass from your public IP to an IP address on your network. Try turning on telnet on your Mac and see if you can get a response from the internet.