Managing and Configuring ISA Server Arrays
The ISA Server Enterprise Edition provides integration with the Active Directory and additional benefits and features such as centralized server management, multiple levels of access policy, server clustering through arrays, fault-tolerant, and the increased efficiencies of hierarchical and distributed caching. The ISA Server Enterprise Edition uses Cache Array Routing Protocol (CARP) to provide scaling and improve efficiency. When you install multiple
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Configuring ISA Server for Web PublishingWith ISA Server, you can use the methods below to secure access to an internal Web server: Configure protocol filters and packet filers to allow Web protocols to pass through the firewall to the Web server. Configure Web publishing rules on the firewall There are a number of tasks that you need to perform to allow access to the internal Web server through Web publishing rules: Configure Web site domain resolution: Here, the public Web server address s
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IP Packet Filter Overview
Access rules and packet filtering should be configured on firewalls to control both source and destination addresses and ports. With packet filtering, you can manage the flow of IP packets to ISA Server and from ISA Server. Packet filtering inspects the header of each packet for protocol, port, and destination address and source address information. Packets are dropped if they are not explicitly allowed.
IP packet filters can be configured when ISA Server is installed
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Proxy Server Arrays Overview
Proxy Server provides a feature called proxy arrays. A proxy array is a solution whereby one or multiple proxy servers operate as a single cache for client requests.
Each Proxy Server server that belongs to the proxy array performs the following functions:
Maintains membership information for the proxy array. This information provides input on which array members are available and which array members are unavailable. A client therefore has to only query one
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Designing a Proxy Server Implementation
Before you can design a Proxy Server implementation and install Proxy Server, you need to be knowledgeable on a number of concepts:
IP routing concepts
Firewalls concepts
Packet filtering concepts
Files and protocols utilized in Web applications
To design a Proxy Server implementation, there are a number of factors that has an impact on the Proxy Server design:
The characteristics of data that will pass to the P
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Why Upgrade to ISA Server
A few reasons for migrating from Proxy Server 2.0 to ISA Server are listed here:
You need a H.323 Filter Gatekeeper.
You need a multi-layered firewall.
You need a firewall client.
You need to perform SSL traffic inspection.
You want to perform email-content screening.
Stateful inspection has become important.
You need secure publishing.
You want to use smart application filters.
You require advanced
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ISA Server Planning Overview
When planning your ISA Server installation, there are a number of factors that you need to consider and others that you need to determine:
How network topology needs to be configured to incorporate ISA Server.
The size of the network.
How you are going to achieve Internet connectivity.
The needs and requirements of users.
Active Directory integration requirements.
The different ISA Server installation options. Is ISA Server going to be as a standalon
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Understanding the ISA Server Reporting Feature
ISA Server includes a reporting feature that you can use for a number of purposes:
Use reports to obtain and view information on usage statistics of the server for both computers and client users.
Create your own reports.
Each report here consists of a number of sub-reports, taking the form of charts and graphs. This concept is illustrated on the 2nd page of the Article:
The predefined ISA Server reports are listed here:
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Configuring ISA Server Logging
ISA Server, by default, creates one log file for the following activities each day:
Firewall service activity
Web Proxy service activity
Packet filtering activity
Information is logged in the ISALogs folder in the ISA Server installation folder:
FWSEXTDyyyymmdd.log - contains information on packets processed by the ISA Server Firewall service.
WEBEXTDyyyymmdd.log - contains information on packets processed by the Web Proxy service.
IPPEXTDyyyykm
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ISA Server Client Types Overview
The different ISA Server client types are:
Firewall client: These are client computers on which Firewall Client software is installed and enabled.
SecureNAT client: These are client computers that have no Firewall Client software installed and enabled.
Web Proxy client: These are client Web applications which are set up to use the ISA Server computer.
You have to consider the needs of the organization before you install any client software:
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