This paper describes the investigation process and implementation of IPSec policies to manage a wide range of communication traffic between two Windows 2000 servers. The use of IPSec allowed us to configure an ISA Proxy server to authenticate user login information back to an internal DC through a high security firewall. Extra configuration involving name resolution and security lockdowns completed our solution for a secure and functional proxy implementation. One of the most difficult aspects of firewall design is balancing security with functionality. In the absence of business requirements it is a straightforward task to design a highly secure firewall and DMZ environment, however, providing functionality to the organization being protected by the perimeter network is every bit as important as providing high security.
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