[App_rpt-users] 2 systems on one LAN, each with an echolink number?

I have 2 AllStarLink systems on one LAN. Each is for a separate repeater system with a separate computer. They share a common Internet address. For AllStar they work fine. For EchoLink I can only make one or the other of them work, but not both. Is there a way to change the port number of one of the echolink nodes so that they can both use the same Internet address? We want them both to be able to have inbound and outbound connections via echolink, independent of each other. Chuck