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what kind of firewall router are you using? do you only have one public IP?<br />
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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.<br />
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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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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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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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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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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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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?

VPN Windows 2008

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.

Windows Server 2008

A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.