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Automatic Discovery Automatic Discovery is a feature in ISA Server that enables Firewall and Web Proxy clients to discover an ISA Server computer automatically. Firewall clients Firewall clients are computers that have Firewall Client software installed and enabled. Firewall clients provide the highest level of functionality and security of the various types of clients. SecureNAT clients SecureNAT clients do not require any client installation or configuration. SecureNAT clients are configured to route all requests for resources on other networks to the internal IP address of the computer running ISA Server. Web Proxy clients Web Proxy clients are any computers that run HTTP 1.1 compatible Web applications such as Web browsers. The Web applications must be configured to use the ISA Server as a proxy server. Winsock applications Winsock applications use sockets to communicate with services running on other computers. The Firewall Client intercepts Winsock application requests and redirects them to the ISA Server computer.

The Advanced tab, shown in Figure 5-6, allows you to enable, disable, and configure certain DNS server options and features such as recursion, round robin, automatic scavenging, and netmask ordering. To learn more about the features configurable on this tab, see Lesson 3, Configuring Advanced DNS Server Properties, in this chapter.

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Whereas the Forwarders tab allows you to disable recursion on selected queries for domains used with forwarders, the Advanced tab allows you to disable recursion for all que ries received by the local DNS server.

Note If you disable recursion on a DNS server using the Advanced tab, you cannot use forwarders on the same server, and the Forwarders tab becomes inactive.

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You can also use Nslookup to resolve IP addresses to host names. For example, the fol lowing command executed at the command prompt returns the FQDN associated with the address 207.46.230.220, as shown in this output:

1. You have deployed ISA Server 2004 as your enterprise firewall solution. Your enterprise consists of multiple operating systems, including UNIX and Novell clients. You run TCP/IP as your network protocol. The client IP addresses and options are assigned through DHCP. All clients have HTTP 1.1 compliant Web browsers installed. All internal employees will require the same level of access to the Internet. You need to minimize the effort required to deploy the ISA Server clients. What ISA Server client will work best to provide simple Internet access for your internal employees

C:\>nslookup 207.46.249.222 Server: localhost Address: 127.0.0.1 Name: www.microsoft.com Address: 207.46.249.222

Although either the Web Proxy client or the SecureNAT client will work, the SecureNAT client is the better solution because of the ease of deployment and because there is no requirement for authentication. You only need to configure the default gateway and you can easily use DHCP to provide the gateway address. The Firewall Client software can only be deployed to Microsoft clients and would require software installation and configuration.

create a Security log entry on a domain controller each time a user logs on interactively or over the network using a domain account. Second, remember that to evaluate fully the results of the auditing, you must examine the Security logs on all domain controllers, because user authentication is distributed among each domain controller in a site or domain.

Reverse lookups rely on pointer (PTR) resource records configured in reverse lookup domains. Reverse lookup domains are not available for all Internet hosts.

2. You have deployed ISA Server 2004 as your enterprise firewall solution. You use Active Directory and all your client computers run Microsoft operating systems. Due to limited Internet bandwidth, you must restrict Internet access to selected departments during business hours. Your employees also need access to a RealPlayer streaming media application on an external Web site. What ISA Server client works best for your situation

If you need to resolve more than a single host name or IP address, or if you want to troubleshoot DNS by performing various functions, you can use Nslookup as an interactive program. To enter interactive mode, simply type nslookup at the command prompt and press Enter.

To restrict access to only certain employees, you must use a client that supports authentication. In this case, you must use the Firewall Client software because it provides support for authentication and support for multiple protocols such as the RealPlayer streaming media application. The SecureNAT client does not support authentication, and the Web Proxy client only supports HTTP HTTPS, and FTP over HTTP , .

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