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VPN Windows 2008

Posted on 2011-03-02
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Last Modified: 2012-05-11
I have a VPN setup on Windows 2008, we also have a leased line router which also does NAT and has been assigned a static ip address. What do we need to do to access the VPN on Windows 2008?
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Question by:mail2clk
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by:digitap
ID: 35019204
what kind of firewall router are you using? do you only have one public IP?

you're biggest issue is going to be NAT. ipsec does not handle NAT well. if your firewall router allows IPSEC passthrough, then you might be OK.

what i typically see is the VPN device is directly on the Internet with a public IP address. for you and if your 2008 server doesn't have an additional NIC, i'd put a NIC in your server, give it a public IP address. then, if your firewall router allows it, configure a port on the firewall in transparent mode. connect that additional NIC to that interface and away you go. if not, then put a switch between the internet connection and your firewall. connect the firewall and your 2008 server to the switch...away you go.
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by:mail2clk
ID: 35019312
Thanks, there is only one public ip address and the router is a 3Com router. Would port forwarding work with PPTP VPN?
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digitap earned 2000 total points
ID: 35019435
port forwarding NATs the the public to the private IP address. there are VPN protocols that are happy behind a NAT appliance like your 3Com. the first link below describes different protocols. the second link describes some things you can do on your 2008 server depending on what protocol you choose so you can still NAT. the first is informational and the second, i think, will help you implement your vpn using your current network configuration.

http://technet.microsoft.com/en-us/library/cc783910%28WS.10%29.aspx

http://support.microsoft.com/kb/926179
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