Resolved Router Setup Information.

I hope my explanation of this problem is clear enough for someone to understand.

I have a Home Network with 2 PC's, one called 'Neptune', IP Address 192.168.1.1, and the other 'Pluto', IP Address 192.168.1.2.

On each of these machines I would like to have a web page with a link to an FTP Server on the same machine.

On 'Neptune' I would like to have 'w??.animals.com' with a link to FTP_Animals using Port 3333 on the same PC, and w??.birds.com with a link to FTP_Birds on 'Pluto' using Port 9999.

If I am correct, to set up the FTP Servers I understand I have to install an FTP Program on each machine, and I have to set up Port Forwarding on my Router, directing incoming requests for Port 3333 to FTP_Animals, and requests for Port 9999 to FTP_Birds.

I would like to use the same FTP Program on each of these machines for arguments sake, 'SharkFTP'.

The Router I have is an ZYXEL Model VSG1432

Now that I have explained everything so crystal clearly , when I go to 'Add a New Rule' for Port Forwarding, I get the following required information:-

A blank box headed 'Active' which should be checked or left unchecked I presume, and the fields,

Service Name
External Start Port
External End Port
Internal Start Port
Internal End Port
Protocol (3 Choices - TCP, UDP, TC/UDP)
Server IP Address 192.168.1.(Blank)
Application Category (8 Choices - None, All, Games, Game Consoles, Audio/Video, Applications, VPN, Servers)

My question now therefore is, "What do I enter in each of these fields for each Port, ie 3333 and 9999? "

Many Thanks.