External SAP Portal for Bidders in SRM 7.0

Hi All
In the strategic sourcing Business Scenario, we need to enable the bidders to submit their bids from outside the network firewall.
Some questions in this regard:
1) Should we have a separate portal for the bidders ( from the one used by the employees inside the firewall) for security
purpose?? Earlier I had seen a different URL for SAP enterprise portal for external vendors at a client place.However not sure if it is a single Portal instance or two separate ones.
2) Do we need to install a SAP Web dispatcher in the DMZ as suggested by SAP in the SRM 7.0 security guide for the external portal? Could we simply make the Enterprise portal available outside without setting up the DMZ
3) Since portal is role based, the suppliers won't be able to access anything else, then the process bids screen.What are the other security concerns if the same portal is shared between employees and suppliers?
Regards
Kedar

Hi
Bidding always happens in your SRM System, although External partners execute that activity. It really depends on your security policies whether you want to give them http or https access...
Regards
Virender Singh

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