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L2TP/IPSec behind NAT-ed Device !

Hello everyone !

My topology is follow

Clients -> |NAT-ed Router| --------- (INTERNET) ------- |NAT-ed Router of Head Office | --------- | ASA5550 (L2TP VPN Server) |--------- LAN

- ASA5550 are working as L2TP VPN Server.

- Clients are using Windows 2000, Windows XP (SP2), Windows XP (SP3), Windows 2003 Server, Vista, Windows 7.

- NAT-ed Router of Head Office is 3845.

I NAT-ed the interface outside of ASA 5550 to allow users from Internet can connect. However, I found many problems as following:

-  Windows 2000 and Windows XP (SP2), L2TP/IPSec can work normally. (after updating the patch of Microsoft http://support.microsoft.com/kb/885407 )

-  Windows XP (SP3), Windows 2003 Server, Vista, Windows 7 CAN NOT WORK

I think problem is relating to Microsoft but I still does not find any document to solve this problems.

Do anyone have experiences to solve this problem?


Thanks

Chidd

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