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I have a client with a single Static IP Address that exposes their Windows 2008 SBS server to the Internet for Email and OWA. They want to install a Cisco 5505 to allow for VPN access. Typically, when I set them up, I have the Cisco 5505 Outside Interface have an IP address that the VPN clients connect to. I then have another IP address that is routed through the Cisco Router as a Static Route to expose the SMTP and OWA services. <br />
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This client only has one IP address and I'm not sure if that can be done and what the configuration should be. <br />
<br />
Thanks.
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I have a client with a single Static IP Address that exposes their Windows 2008 SBS server to the Internet for Email and OWA. They want to install a Cisco 5505 to allow for VPN access. Typically, when I set them up, I have the Cisco 5505 Outside Interface have an IP address that the VPN clients connect to. I then have another IP address that is routed through the Cisco Router as a Static Route to expose the SMTP and OWA services. 

This client only has one IP address and I'm not sure if that can be done and what the configuration should be. 

Thanks.

Cisco 5505 VPN Configuration

Cisco PIX is a dedicated hardware firewall appliance; the Cisco Adaptive Security Appliance (ASA) is a firewall and anti-malware security appliance that provides unified threat management and protection the PIX does not. Other Cisco devices and systems include routers, switches, storage networking, wireless and the software and hardware for PIX Firewall Manager (PFM), PIX Device Manager (PDM) and Adaptive Security Device Manager (ASDM).

Cisco

A virtual private network (VPN) is a network that uses a public telecommunication infrastructure, such as the Internet, to provide remote offices or travelling users access to a central organizational network securely. VPNs encapsulate data transfers using secure cryptographic methods and other security mechanisms to ensure that only authorized users can access the network and that the data cannot be intercepted.

Internet Protocol Security (IPsec) is a protocol suite for secure Internet Protocol (IP) communications by authenticating and encrypting each IP packet of a communication session. IPsec includes protocols for establishing mutual authentication between agents at the beginning of the session and negotiation of cryptographic keys to be used during the session. IPsec can be used in protecting data flows between a pair of hosts (host-to-host), between a pair of security gateways (network-to-network), or between a security gateway and a host (network-to-host). IPsec is an end-to-end security scheme operating in the Internet Layer of the Internet Protocol Suite.