Server publishing rules require an additional NIC
Updated: February 1, 2011
Applies To: Forefront Threat Management Gateway (TMG)
The single network adapter configuration is designed to be used for Web proxying and caching, and not as an edge firewall. Server publishing rules, which use network address translation (NAT) to protect the identity of internal publishing servers, are not useful in such a configuration.
If you want to use server publishing rules effectively, you should configure your Forefront TMG with an additional adapter.