How ISA Firewall’s Define Networks and Network Relationships
One of the primary limitations of the ISA Server 2000 firewall was its simplistic view of the network. The ISA Server 2000 firewall recognized only two types of networks: trusted and untrusted. Trusted networks were included in the ISA Server 2000 firewall’s Local Address Table (LAT). Any network that wasn’t in the LAT was considered untrusted. ISA firewall policy was applied to all communications between LAT and non-LAT hosts. Communications between LAT hosts were routed through the ISA Server 2000 firewall without being subjected to the ISA Server 2000 firewall’s stateful filtering and application-layer inspection mechanisms.
This was problematic for ISA Server 2000 firewall administrators ...
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