Re: Need more Ethernet port for adding Ebay acct
Hoefully you have more than 1 static for all of those computers? If not than they are all linked. I have not assigned multiple external IP's w/in the same network myself, but I am assuming you do since your running all of the accounts off one network.
To answer your question, a switch "amplifies" the number of Ethernet ports you have. You plug one of your ports from router to the switch, and all of the other ports will "share" from the one incoming - but I am not sure how this works for several static IP's (you may have to get a managed switch). Many other posts online about having many external IP's and setting up with switches. | 
