The Post-installation System Policy - Dr. Tom Shinderamp;#039;s Configuring ISA Server 1002004 [Electronic resources] نسخه متنی

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Dr. Tom Shinderamp;#039;s Configuring ISA Server 1002004 [Electronic resources] - نسخه متنی

Thomas W. Shinder; Debra Littlejohn Shinder

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Back Cover Dr. Tom Shinder's Configuring ISA Server 2004 Introduction Acknowledgments About the Authors Technical Editor A Note From the Publisher From Deb and Tom Shinder, Authors Chapter 1: Evolution of a Firewall: From Proxy 1.0 to ISA 2004 The Book: What it Covers and Who It's For It's in the Book: What We Cover This Book's For You: Our Target Audience Security: The New Star of the Show Security: What's Microsoft Got to Do with It? Security: A Policy-Based Approach Security: A Multilayered Approach Firewalls: The Guardians at the Gateway Firewalls: History and Philosophy Firewalls: Understanding the Architecture Firewalls: Features and Functionality Firewalls: Role and Placement on the Network ISA: From Proxy Server to Full-Featured Firewall ISA: A Glint in MS Proxy Server's Eye ISA: A Personal Philosophy Summary Chapter 2: Examining the ISA Server 2004 Feature Set The New GUI: More Than Just a Pretty Interface Examining the Graphical Interface Examining The Management Nodes Teaching Old Features New Tricks Enhanced and Improved Remote Management Enhanced and Improved Firewall Features Enhanced and Improved Virtual Private Networking and Remote Access Enhanced and Improved Web Cache and Web Proxy Enhanced and Improved Monitoring and Reporting Multi-Networking Support New Application Layer Filtering (ALF) Features VPN Quarantine Control Missing in Action: Gone but Not Forgotten Live Media Stream Splitting H.323 Gateway Bandwidth Control Active Caching Summary Solutions Fast Track New GUI: More Than Just a Pretty Face Teaching Old Features New Tricks New Features on the Block Missing in Action: Gone But Not Forgotten Frequently Asked Questions Chapter 3: Stalking the Competition: How ISA 2004 Stacks Up Firewall Comparative Issues The Cost of Firewall Operations Specifications and Features Comparing ISA 2004 to Other Firewall Products ISA Server 2004 Comparative Points Comparing ISA 2004 to Check Point Comparing ISA 2004 to Cisco PIX Comparing ISA 2004 to NetScreen Comparing ISA 2004 to SonicWall Comparing ISA 2004 to WatchGuard Comparing ISA 2004 to Symantec Enterprise Firewall Comparing ISA 2004 to Blue Coat SG Comparing ISA 2004 to Open Source Firewalls Summary Comparing Architecture Comparing Functionality Comparing Cost Solutions Fast Track Firewall Comparative Issues Comparing ISA 2004 to Other Firewall Products Frequently Asked Questions Chapter 4: ISA 2004 Network Concepts and Preparing the Network Infrastructure Our Approach to ISA Firewall Network Design and Defense Tactics Defense in Depth ISA Firewall Fallacies Software Firewalls are Inherently Weak You Can't Trust Any Service Running on the Windows Operating System to be Secure ISA Firewalls Make Good Proxy Servers, but I Need a 'Real Firewall' to Protect My Network ISA Firewalls Run on an Intel Hardware Platform, and Firewalls Should Have 'No Moving Parts' 'I Have a Firewall and an ISA Server' Why ISA Belongs in Front of Critical Assets A Better Network and Firewall Topology Tom and Deb Shinder's Configuring ISA 2004 Network Layout Creating the ISALOCAL Virtual Machine How ISA Firewall’s Define Networks and Network Relationships ISA 2004 Multinetworking The ISA Firewall’s Default Networks Creating New Networks Controlling Routing Behavior with Network Rules The ISA 2004 Network Objects ISA Firewall Network Templates Dynamic Address Assignment on the ISA Firewall’s External Interface Dial-up Connection Support for ISA firewalls, Including VPN Connections to the ISP “Network Behind a Network” Scenarios (Advanced ISA Firewall Configuration) Web Proxy Chaining as a Form of Network Routing Firewall Chaining as a Form of Network Routing Configuring the ISA Firewall as a DHCP Server Summary Solutions Fast Track Our Approach to the ISA Firewall Network Design and Defense Tactics Tom and Deb Shinder's Configuring ISA 2004 Network Layout How ISA Firewalls Define Networks and Network Relationships Frequently Asked Questions Chapter 5: ISA 2004 Client Types and Automating Client Provisioning Understanding ISA 2004 Client Types Understanding theISA 2004 SecureNAT Client Name Resolution for SecureNAT Clients Name Resolution and 'Looping Back' Through the ISA 2004 Firewall Understanding the ISA 2004 Firewall Client ISA 2004 Web Proxy Client ISA 2004 Multiple Client Type Configuration Deciding on an ISA 2004 Client Type Automating ISA 2004 Client Provisioning Configuring DHCP Servers to Support Web Proxy and Firewall Client Autodiscovery Configuring DNS Servers to Support Web Proxy and Firewall Client Autodiscovery Special Considerations for VPN Clients Automating Installation of the Firewall Client Configuring Firewall Client and Web Proxy Client Configuration in the ISA Management Console Group Policy Software Installation Silent Installation Script Systems Management Server (SMS) Summary Solutions Fast Track Understanding the ISA 2004 SecureNAT Client Understanding the ISA 2004 Web Proxy Client Understanding the ISA 2004 Firewall Client Frequently Asked Questions Chapter 6: Installing and Configuring the ISA Firewall Software Pre-installation Tasks and Considerations System Requirements Configuring the Routing Table DNS Server Placement Configuring the ISA Firewall's Network Interfaces Unattended Installation Installation via a Terminal Services Administration Mode Session Performing a Clean Installation on a Multihomed Machine Default Post-installation ISA Firewall Configuration The Post-installation System Policy Performing an Upgrade Installation Performing a Single NIC Installation (Unihomed ISA Firewall) Quick Start Configuration for ISA Firewalls Configuring the ISA Firewall's Network Interfaces Installing and Configuring a DNS Server on the ISA Server Firewall Installing and Configuring a DHCP Server on the ISA Server Firewall Installing and Configuring the ISA Server 2004 Software Configuring the Internal Network Computers Hardening the Base ISA Firewall Configuration and Operating System ISA Firewall Service Dependencies Service Requirements for Common Tasks Performed on the ISA Firewall Client Roles for the ISA Firewall Lockdown Mode Connection Limits DHCP Spoof Attack Prevention Summary Solutions Fast Track Pre-installation considerations Performing a clean installation Default Post-install System Policy and Firewall Configuration Frequently Asked Questions Chapter 7: Creating and Using ISA 2004 Firewall Access Policy Introduction ISA Firewall Access Rule Elements Protocols User Sets Content Types Schedules Network Objects The Rule Action Page The Protocols Page The Access Rule Sources Page The Access Rule Destinations Page The User Sets Page Access Rule Properties The Access Rule Context Menu Options Configuring RPC Policy Configuring FTP Policy Configuring HTTP Policy Ordering and Organizing Access Rules How to Block Logging for Selected Protocols Disabling Automatic Web Proxy Connections for SecureNAT Clients Using Scripts to Populate Domain Name Sets Using the Import Scripts Extending the SSL Tunnel Port Range for Web Access to Alternate SSL Ports Avoiding Looping Back through the ISA Firewall for Internal Resources Anonymous Requests Appear in Log File Even When Authentication is Enforced For Web (HTTP Connections) Blocking MSN Messenger using an Access Rule Allowing Outbound Access to MSN Messenger via Web Proxy Changes to ISA Firewall Policy Only Affects New Connections Configure the Routing Table on the Upstream Router Configure the Network Adaptors Install the ISA Server 2004 Firewall Software Install and Configure the IIS WWW and SMTP Services on the DMZ Server Create the DMZ Network Create the Network Rules Between the DMZ and External Network and for the DMZ and Internal Network Create Server Publishing Rule Allowing DNS from DMZ to Internal Create an Access Rule Allowing DNS from Internal to External Create an Access Rule Allowing DNS from Internal to External Create an Access Rule Allow HTTP from External to DMZ Create an Access Rule Allowing SMTP from External to DMZ Test the Access Rules from External to DMZ Test the DNS Rule from the DMZ to the Internal Network Change the Access Rule Allowing External to DMZ by Disabling the Web Proxy Filter Allowing Intradomain Communications through the ISA Firewall Solutions Fast Track Configuring Access Rules for Outbound Access through the ISA Firewall Using Scripts to Populate Domain Name Sets Creating and Configuring a Public Address Trihomed DMZ Network Frequently Asked Questions Chapter 8: Publishing Network Services with ISA 2004 Firewalls Overview of Web Publishing and Server Publishing Web Publishing Rules Server Publishing Rules The Select Rule Action Page The Define Website to Publish Page The Public Name Details Page The Select Web Listener Page and Creating an HTTP Web Listener The User Sets Page The Web Publishing Rule Properties Dialog Box Creating and Configuring SSL Web Publishing Rules SSL Bridging Importing Web Site Certificates into The ISA Firewall's Machine Certificate Store Requesting a User Certificate for the ISA Firewall to Present to SSL Web Sites Creating an SSL Web Publishing Rule Creating Server Publishing Rules The Server Publishing Rule Properties Dialog Box Server Publishing HTTP Sites Creating Mail Server Publishing Rules The Web Client Access: Outlook Web Access (OWA), Outlook Mobile Access, Exchange Server ActiveSync Option The Client Access: RPC, IMAP, POP3, SMTP Option Summary Solutions Fast Track Overview of Web Publishing and Server Publishing Creating and Configuring Non-SSL Web Publishing Rules Creating and Configuring SSL Web Publishing Rules Frequently Asked Questions Chapter 9: Creating Remote Access and Site-to-Site VPNs with ISA Firewalls Overview of ISA Firewall VPN Networking Firewall Policy Applied to VPN Client Connections Firewall Policy Applied to VPN Site-to-Site Connections VPN Quarantine User Mapping of VPN Clients SecureNAT Client Support for VPN Connections Site-to-Site VPN Using Tunnel Mode IPSec Publishing PPTP VPN Servers Pre-shared Key Support for IPSec VPN Connections Advanced Name Server Assignment for VPN Clients Monitoring of VPN Client Connections Creating a Remote Access PPTP VPN Server Enable the VPN Server Create an Access Rule Allowing VPN Clients Access to Allowed Resources Enable Dial-in Access Test the PPTP VPN Connection Issue Certificates to the ISA Firewall and VPN Clients Test the L2TP/IPSec VPN Connection Monitor VPN Clients Using a Pre-shared Key for VPN Client Remote Access Connections Creating a PPTP Site-to-Site VPN Create the Remote Site Network at the Main Office Create the Network Rule at the Main Office Create the Access Rules at the Main Office Create the VPN Gateway Dial-in Account at the Main Office Create the Remote Site Network at the Branch Office Create the Network Rule at the Branch Office Create the Access Rules at the Branch Office Create the VPN Gateway Dial-in Account at the Branch Office Activate the Site-to-Site Links Enable the System Policy Rule on the Main Office Firewall to Access the Enterprise CA Request and install a Web Site Certificate for the Main Office Firewall Configure the Main Office ISA Firewall to Use L2TP/IPSec for the Site-to-Site Link Enable the System Policy Rule on the Branch Office Firewall to Access the Enterprise CA Request and Install a Web Site Certificate for the Branch Office Firewall Configure the Main Office ISA Firewall to Use L2TP/IPSec for the Site-to-Site Link Activate the L2TP/IPSec Site-to-Site VPN Connection Configuring Pre-shared Keys for Site-to-Site L2TP/IPSec VPN Links IPSec Tunnel Mode Site-to-Site VPNs with Downlevel VPN Gateways Using RADIUS for VPN Authentication and Remote Access Policy Configure the Internet Authentication Services (RADIUS) Server Create a VPN Clients Remote Access Policy Remote Access Permissions and Domain Functional Level Changing the User Account Dial-in Permissions Changing the Domain Functional Level Controlling Remote Access Permission via Remote Access Policy Enable the VPN Server on the ISA Firewall and Configure RADIUS Support Create an Access Rule Allowing VPN Clients Access to Approved Resources Make the Connection from a PPTP VPN Client Using EAP User Certificate Authentication for Remote Access VPNs Configuring the ISA Firewall Software to Support EAP Authentication Enabling User Mapping for EAP Authenticated Users Issuing a User Certificate to the Remote Access VPN Client Machine Supporting Outbound VPN Connections through the ISA Firewall Installing and Configuring the DHCP Server and DHCP Relay Agent on the ISA Firewall Creating a Site-to-Site VPN Between an ISA Server 2000 and ISA Firewall Run the Local VPN Wizard on the ISA Server 2000 firewall Change the Password for the Remote VPN User Account Change the Credentials the ISA Server 2000 Firewall uses for the Demand-dial Connection to the Main Office Change the ISA Server 2000 VPN Gateway's Demand-dial Interface Idle Properties Create a Static Address Pool for VPN Clients and Gateways Run the Remote Site Wizard on the Main Office ISA firewall Create a Network Rule that Defines the Route Relationship Between the Main and Branch Office Create Access Rules Allowing Traffic from the Main Office to the Branch Office Create the User Account for the Remote VPN Router Test the connection A Note on VPN Quarantine Summary Solutions Fast Track Overview of ISA Firewall VPN Networking Creating a Remote Access PPTP VPN Server Creating a Remote Access L2TP/IPSec Server Frequently Asked Questions Chapter 10: ISA 2004 Stateful Inspection and Application Layer Filtering Introduction Application Filters The SMTP Filter and Message Screener The DNS Filter The POP Intrusion Detection Filter The SOCKS V4 Filter The FTP Access Filter The H.323 Filter The MMS Filter The PNM Filter The PPTP Filter The RPC Filter The RTSP Filter Web Filters The HTTP Security Filter (HTTP Filter) The ISA Server Link Translator The Web Proxy Filter The SecurID Filter The OWA Forms-based Authentication Filter The RADIUS Authentication Filter IP Filtering and Intrusion Detection/Intrusion Prevention Common Attacks Detection and Prevention DNS Attacks Detection and Prevention IP Options and IP Fragment Filtering Summary Solutions Fast Track Application Layer Filters Web Filters Intrusion Detection and Prevention Frequently Asked Questions Chapter 11: Accelerating Web Performance with ISA 2004 Caching Capabilities Understanding Caching Concepts Web Caching Types Web Caching Architectures Web Caching Protocols Understanding ISA Server 2004's Web Caching Capabilities Using the Caching Feature Understanding Cache Rules Understanding the Content Download Feature Configuring ISA Server 2004 as a Caching Server Enabling and Configuring Caching How to Configure Caching Properties Creating Cache Rules Configuring Content Downloads Summary Fast Track Frequently Asked Questions Chapter 12: Using ISA Server 2004's Monitoring, Logging, and Reporting Tools Introduction Exploring the ISA Server 2004 Dashboard Dashboard Sections Configuring and Customizing the Dashboard Creating and Configuring ISA Server 2004 Alerts Alert-triggering Events Viewing the Predefined Alerts Creating a New Alert Modifying Alerts Viewing Triggered Alerts Monitoring ISA Server 2004 Connectivity, Sessions, and Services Configuring and Monitoring Connectivity Monitoring Sessions Monitoring Services Working with ISA Server 2004 Logs and Reports Understanding ISA Server 2004 Logs Generating, Viewing, and Publishing Reports with ISA Server 2004 Using ISA Server 2004's Performance Monitor Solutions Fast Track Exploring the ISA Server 2004 Dashboard Creating and Configuring ISA Server 2004 Alerts Monitoring ISA Server 2004 Sessions and Services Working with ISA Server 2004 Logs and Reports 1Using ISA Server 2004's Performance Monitor Frequently Asked Questions Appendix: Network Security Basics Introduction Security Overview Defining Basic Security Concepts Knowledge is Power Think Like a Thief Security Terminology Addressing Security Objectives Controlling Physical Access Preventing Accidental Compromise of Data Preventing Intentional Internal Security Breaches Preventing Unauthorized External Intrusions Recognizing Network Security Threats Understanding Intruder Motivations Classifying Specific Types of Attacks Designing a Comprehensive Security Plan Evaluating Security Needs Understanding Security Ratings Legal Considerations Designating Responsibility for Network Security Designing the Corporate Security Policy Educating Network Users on Security Issues Incorporating ISA Server in your Security Plan ISA Server Intrusion Detection Implementing a System Hardening Plan with ISA Summary Index Numbers Index A Index B Index C Index D Index E Index F Index G Index H Index I Index J Index K Index L Index M Index N Index O Index P Index Q Index R Index S Index T Index U Index V Index W Index Z List of Figures List of Tables List of Sidebars

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The Post-installation System Policy




ISA Firewall Policy is a collection of Access Rules controlling access to and from the Local Host network. System Policy controls access to and from the system. You do not configure System Policy for network access between any other hosts. One of the most common errors made by new ISA firewall administrators is to use System Policy to control access from Protected Network hosts to non-Protected Network hosts.




Table 6.6 shows the list of System Policy rules and their status after installing the ISA firewall software. The Order/Comments column includes our advice regarding configuration of the specific System Policy Rule.












































































































Table 6.6: Default Post-installation System Policy





Order/Comments








Name








Action








Protocols








From/Listener








To








Condition








1




Is the ISA firewall a member of the domain? If not, disable this rule.








Allow access to




directory services




purposes








Allow








LDAP




LDAP (UDP)




LDAP GC (global catalog)




LDAPS




LDAPS GC




(Global Catalog)








Local Host








Internal








All Users








2




If no one is going to use the remote MMC to manage the ISA firewall, disable this




rule.








Allow remote management from selected computers using MMC








Allow








Microsoft Firewall




Control




NetBIOS datagram




NetBIOS




Name Service




NetBIOS




Session




RPC (all interfaces)








Remote Management Computers








Local Host








All Users








3




Confirm that the Remote Management Computers Computer Set has the addresses of the hosts that will manage the ISA firewall; if you don't want to allow RDP management of the ISA firewall, disable this rule. Order/Comments








Allow remote management from selected computers using Terminal Server Name








Allow Action








RDP (Terminal Services) Protocols








Remote Management




Computers From/Listener








Local Host To








All Users Continued Condition








4




(Disabled by default) Enable this rule if you want to log to








Allow remote logging to trusted servers using SQL servers.








Allow








NetBIOS




Datagram




NetBIOS




Name Service




NetBIOS Session








Local Host








Internal








All Users








5




Will you be using RADIUS authentication? If not, disable this rule.








Allow RADIUS authentication from ISA Server to trusted RADIUS servers








Allow








RADIUS




RADIUS




Accounting








Local Host








Internal








All Users








6




Will the ISA firewall be authenticating users? If not, disable this rule.








Allow Kerberos




authentication




from ISA Server




to trusted servers








Allow








Kerberos-Sec (TCP)




Kerberos-Sec




(UDP)








Local Host








Internal








All Users








7




This rule must be enabled so that the ISA firewall can initiate DNS queries.








Allow DNS from ISA Server to selected servers








Allow








DNS








Local Host








All Networks (and Local Host)








All Users








8




If the ISA firewall isn't going to act as a DHCP client, disable this rule. Order/Comments








Allow DHCP requests from ISA Server to all networks Name








Allow Action








DHCP (request) Protocols








Local Host From/Listener








Anywhere To








All Users Continued Condition








9




If the ISA firewall isn't going to act as a DHCP client, disable this rule.








Allow DHCP replies from DHCP servers to ISA Server








Allow








DHCP (reply)








Internal








Local Host








All Users








10




Confirm that you have configured the proper IP addresses for the Remote Management Computers Computer Set.








Allow ICMP (PING) requests from selected computers to ISA Server








Allow








Ping








Remote Management Computers








Local Host








All Users








11




This rule must be enabled so that the ISA firewall can carry out network management tasks via ICMP.








Allow ICMP requests from ISA Server to selected servers








Allow








ICMP Information Request ICMP Timestamp








Local Host








All Networks (and Local Host Network)








All Users








12




(disabled by default)




This rule is automatically enabled when you enable the ISA firewall's VPN server component.








All VPN client traffic to ISA Server








Allow








PPTP








External








Local Host








All Users








13




(disabled by default) This rule is automatically enabled when you enable a site-to-site VPN connection to this ISA firewall. Order/Comments








Allow VPN site- to-site traffic to ISA Server Name








Allow Action








NONE Protocols








External IPSec Remote Gateways From/Listener








Local Host




To








All Users Continued Condition








14




(disabled by default)




This rule is automatically




enabled when you




enable a site-to-site VPN




connection to this ISA




firewall.








Allow VPN site-to- site traffic from ISA Server








Allow








NONE








Local Host








External IPSec Remote Gateways








All Users








15




Will you be trying to access file shares from the ISA firewall? If not, disable this rule








Allow Microsoft CIFS from ISA Server to trusted servers








Allow








Microsoft CIFS (TCP) Microsoft CIFS (UDP)








Local Host








Internal








All Users








16 (disabled by default)




Enable this rule when you choose SQL logging.








Allow remote SQL logging from ISA servers








Allow








Microsoft SQL (TCP) Microsoft SQL (UDP)








Local Host








Internal








All Users








17




Unless you want to allow the ISA firewall to contact the Windows Update site itself, disable this rule. I prefer to download updates to a management machine, scan them, and then copy them out of band to the ISA firewall and install them from that. Order/Comments








Allow HTTP/HTTPS requests from ISA Server to specified sites Name








Allow Action








HTTP HTTPS Protocols








Local Host From/Listener








System Policy Allowed Sites To








All Users Continued Condition








18




(disabled by default) This rule is enabled when you create an HTTP/HTTPS connectivity verifier.








Allow HTTP/HTTPS requests from ISA Server to selected servers for connectivity verifiers








Allow








HTTP HTTPS








Local Host








All Networks (and Local Host Network)








All Users








19




(disabled by default) This rule is enabled if the Firewall client share is installed on the ISA firewall.








Allow access from trusted computers to the Firewall Client installation share on ISA Server








Allow








Microsoft CIFS (TCP) Microsoft CIFS (UDP) NetBIOS Datagram NetBIOS Name Service NetBIOS Session








Internal








Local Host








All Users








20




(disabled by default)




Enable this rule if you want to perform remote performance monitoring of ISA firewall.








Allow remote performance mon- toring of ISA iServer from trusted servers








Allow








NetBIOS Datagram NetBIOS Name Service NetBIOS Session








Remote Management Computers








Local Host








All Users








21




Unless you plan to access file shares from the ISA firewall, disable this rule. Order/Comments








Allow NetBIOS from ISA Server to trusted servers Name








Allow Action








NetBIOS Datagram NetBIOS Name Service NetBIOS Sessions Protocols








Local Host From/Listener








Internal To








All Users Continued Condition








22




Unless you plan to use RPC to connect to other servers, disable this rule.








Allow RPC from ISA Server to trusted servers








Allow








RPC (all interfaces)








Local Host








Internal








All Users








23




This rule allows the ISA firewall to send error reports to Microsoft.








Allow HTTP/HTTPS from ISA Server to specified Microsoft error reporting sites








Allow








HTTP HTTPS








Local Host








Microsoft Error Reporting sites








All Users








24




(disabled by default)




This rule should be enabled if SecurID authentication is enabled.








authentication from ISA Server to trusted servers








Allow








SecurID








Local Host








Internal








All Users








25




(disabled by default)




Enable this rule if you use MOM to monitor the ISA firewall.








Allow remote mon- itoring from ISA Server to trusted servers, using Microsoft Operations Manager (MOM) Agent








Microsoft Operations Manager Agent








Local Host








Internal








All Users








26




(disabled by default)




Enable this rule if you want the ISA firewall to access CRL- required if the ISA terminates any SSL connections. Order/Comments








traffic from ISA Server to all networks (for CRL downloads) Name








Allow + Action








HTTP Protocols








Local Host From/Listener








All Networks (and Local Host) To








All Users Continued Condition








27




You should change this rule by allowing contact with a trusted NTP server in your organization. The Internal entry allows it to contact all servers anywhere in the world.








Allow NTP from ISA Server to trusted NTP servers








Allow








NTP (UDP)








Local Host








Internal








All Users








28




If you don't plan on using SMTP to send alerts, you should disable this rule. If you do plan on sending SMTP alerts, you should replace the Internal Destination with a specific computer that will accept SMTP messages from the ISA firewall.








Allow SMTP from Allow ISA Server to trusted servers








SMTP








Local Host








Internal








All Users








29




(disabled by default) This rule is automatically enabled when Content Download Jobs are enabled.








ISA Server to selected computers for Content Download Jobs








Allow








HTTP








Local Host








All Networks (and Local Host)








System and Network Service








30




Unless you plan on using the remote MMC, disable this rule








Allow Microsoft communication to selected computers








Allow








All Outbound traffic








Local Host








Remote Management Computers








All Users








The ISA firewall's System Policy Rules are evaluated before any user-defined Access Rules in the order listed in the Firewall Policy first column. View the ISA firewall's System Policy by clicking Firewall Policy in the left pane of the console and then clicking the Tasks tab. In the Tasks tab, click Show System Policy Rules. Click Hide System Policy Rules when you're finished viewing the firewall's system policy.









Warning




You can make changes to only some components of the ISA firewall's default System Policy. You will find that there are several instances where you cannot make changes to the ISA firewall's System Policy with the System Policy Editor.








You can edit the ISA firewall's System Policy by clicking Edit System Policy on the Tasks tab. This opens the System Policy Editor, as shown in Figure 6.12. For each System Policy Rule there is a General tab and a From or To tab. The General tab for each Configuration Group contains an explanation of the rule(s), and the From or To tab allows you to control protocol access to or from the ISA firewall machine itself.











Figure 6.12: The ISA Firewall's System Policy Editor













































Table 6.7: Default Port-installation ISA Firewall System Configuration





Feature








Default setting








User permissions








Members of the Administrators group on the local computer can configure firewall policy. If the ISA firewall is a member of the domain, then the Domain Admins global group is automatically included in the local machine's Administrators group.








Definition of Internal network








The Internal network contains IP addresses you specified during setup of the ISA firewall software.








Network Rules








Local Host Access Defines a route relationship between the Local Host network and all networks. All connections between the Local Host network (that is, the ISA firewall machine itself) are routed instead of NATed. Internet Access Defines a NAT (Network Address Translation) relationship between the Internal Network, Quarantined VPN Clients Network, and the VPN Clients Network - to the External network. From each of these three Networks to the Internet, the connection is NATed. Access is allowed only if you configure the appropriate Access Rules. VPN Clients to Internal Network Defines a route relationship between the VPN Clients Network and the Internal Network. Access is allowed only if you enable virtual private network (VPN) client access.








Firewall policy








A default rule (named Default Rule) denies traffic between all networks.








System policy








ISA Server is secure by default, while allowing certain critical services to function. Upon installation, some system policy rules are enabled to allow necessary services. We recommend that you review the system policy configuration and customize it so that only services critical to your specific deployment are enabled.








W eb chaining








A default rule (named Default Rule) specifies that all Web Proxy client requests are retrieved directly from the Internet.








Caching








The cache size is set to 0. All caching is, therefore, disabled.








Alerts








Most alerts are active. We recommend that you review and configure the alerts in accordance with your specific networking needs.








Client configuration








When installed or configured, Firewall and Web Proxy clients have automatic discovery enabled. Web browser applications on Firewall clients are configured when the Firewall client is installed.








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