Linux - VPN Diagram

I have a linux router....i have to do a vpn.... so i have to set any outgoing VPN access will have to go trough my linux router...so in my router i must set the firewall to open the connection....then if verified, the connection will transfer to my windows based vpn server pc.

but i got a D-link VPN router where i want to use it....so is that ok if from the linux router i connect to the D-Link VPN router, and from that it will go to my windows based vpn server pc..

any idea?
emlilyAsked:
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nalanbarConnect With a Mentor Commented:
If I understand correctly, you are having users authenticate to a linux server through a vpn, and then connect to a windows server through another vpn connection?
If you are using a vpn to just connect remote users, you only need one VPN server, and that, I am assuming, would be the d-link router.
What the user will do is connect directly to the router, and then their computer will appear as though it was on the local network that the windows box is on.
Please explain your question to me again. I am sorry that I am making this so difficult, but I want to make sure I don't lead you astra, and I am afraid I don't understand.
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nalanbarCommented:
It should work. On the linux router, are you going to use frees/wan? It will be a tricky config, but it should work, assuming you are looking for this:
network->linux router-> vpn tunnel -> d-link router -> network
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emlilyAuthor Commented:
the linux router is just fowarding the vpn access from external...so vpn tunnel is a pc or software?
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nalanbarCommented:
a vpn tunnel is the stream of encrypted packets going between the two routers. If you think of the internet as a cloud, the vpn tunnel is like an opaque tube that runs through it. No one on the outside can read it, but all of your data is sent accross the open internet, but is encrypted.
I guess I should have asked this question first:
Are you using the VPN to connect two different sites, or is it to allow people with laptops to connect from the road?
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emlilyAuthor Commented:
by the way in my linux router, what port should i open for external vpn accessing to my vpn server...i using pptp
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emlilyAuthor Commented:
i use the vpn for other site of my project to upload data to my server...the other site only has dial up...
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nalanbarCommented:
So it is not a constant connection. You will be connecting for a little while, transfering data, and then disconnecting?
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emlilyAuthor Commented:
yeah..correct
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emlilyAuthor Commented:
it seems to be like this:

vpn client--->linux router( for authenticate )--->D-Link VPN Router----> Windows XP as VPN Server
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