Exposing Portal over Internet

Hi,

We have implemented SAP modules like SRM, BI and HR in our landscape and Portal is the single point for accessing all the available functionalities. Now, we want to access the portal from Internet WITHOUT MAKING OTHER SYSTEMS accessible because of security reasons. With this, I am not able to access SRM applications because it tries to connect to Web AS of SRM system as configured in System Object of Portal.

Please let me know the way or method used in accessing Portal over Internet.

Thanks,

Iftekhar