When a client computer running Firewall Client for ISA Server makes a request, the destination is evaluated by the Firewall Client software, and external requests are directed to the ISA Server computer for handling. No specific routing infrastructure is required. Firewall Client sends user information transparently with each request, enabling you to create a firewall policy on the ISA Server computer with rules that use the authentication credentials presented by the client. ISA Server allows you to configure automatic discovery for Firewall client computers, using a WPAD entry in DNS or DHCP to obtain correct Web proxy settings for clients, depending on their location. This article covers the automatic deployment of the ISA Server 2006 Firewall client in a SBS 2008 network.