You will have to have two servers for this. One for the internal users and another one for the External users.
QlikView Extranet Server (QES)
QES allows end users to deploy QlikView solutions to their extranet. QES is based on QlikView EE Server, but only supports up to three QlikView documents. The server can be deployed with a combination of Session and Usage CALs. QES supports mobile clients and can be deployed in clustered environments. The AJAX client or a customized AJAX client can be used via QlikView WorkBench, which is included in QES.