QUESTION POSED ON: 01 May 2002 What is your opinion of using a routable IP address behind a firewall or
in the DMZ? (Basically the IP would be internic viable, all communication
would be via a VPN.) Unfortunately, the VPN in this case will not work with
NAT. Thus, a routable IP is required in the DMZ.
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This is a common problem, as NAT tends to interfere with many VPN solutions. If you need the VPN to be behind the firewall rather than in parallel with
it, using a routable IP address is not only okay, but likely the only way it will work. However, with many firewalls, you can have a separate set of firewall rules for the interface the VPN is connected to. Thus you can setup your firewall to block all ports and protocols other than what is needed by the VPN. That will provide the maximum level of protection.
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