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18. Click the Network Relationship tab. The default setting is Network Address
Translation (NAT). This is a slightly higher security configuration because it hides the
addresses of the Internal network clients that connect to perimeter network hosts.
However, NAT relationships can complicate access for certain protocols as not all
protocols support address translation. In our current example, select the Route
relationship to improve on the level of protocol access at the cost of a slight reduction in
overall security. Keep in mind that, at this point, there are no Access Rules that allow
access to the Internal network from the perimeter network.
ISA Server 2004 Configuration Guide 110