EFP and Intranet Portal - Best Practices for architecture

Hi All,
   We are planning to create a portal for our partners  (b2b scenario). This portal will provide anonymous  and user specific access. We also have a intranet portal with ESS and MSS.  I have some doubts around implementing EFP and Intranet portal.
   1) What is the best practice solution architecture around portal instances? Is it suggested to implement both intranet and internal portals on same portal instance? Do you implement them as 2 seperate instances (and 2 seperate boxes) one for intranet and another for internet?
   2) There are couple of functions shared between inranet and internet portals. Has any one attempted   a FPN connection between a internet portal and intranet portal?
   3)  What is the best practices around an external portal connecting to ECC directly?
Any suggestions are greatly appreciated.

Hi Pallayya,
         We are implementing a similar kind of thing for our client.I can explain that so you find some glimpse out of it.
We have decided twp ways.
1) We are having one instance of the portal that will be accessed both in Intranet & Internet.We are using two different URL for intranet & internet.We have a reverse proxy in the picture also,coz it will increase the security of the portal in the Internet.The reverse proxy will be available in the DMZ Zone.We have integrated ECC & BW with the portal and some web dynpro application(For intranet only).
Now the user comes from the Internet will hit the reverse proxy first->then it will go to EP Server->in EP it will be decided which kind of request client is asking ->
If it is a ECC request->Portal Server sends back the request to Reverse Proxy->RP will send it to web dispatcher->Then it will go to ECC.
If it is a BW request ->Portal server sends the request to BW Server.
2) There will be two different URLS for the portal in Intranet & Internet
     For that we used two reverse proxy
regards
Indranil

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