Transcript Installing and Maintaining ISA Server

Installing and Maintaining
ISA Server
Planning an ISA Server
Deployment
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Understand the current network infrastructure
Review company security policies
Plan the required network infrastructure
Plan for branch office installations
Plan for availability and fault tolerance
Plan for access to the Internet
Plan the ISA Server client implementation and
deployment
• Plan for server publishing
• Plan for VPN deployment
• Plan the implementation
Network Infrastructure
Requirements
• DNS
• Domain controllers
• DHCP
Domain Name System
Requirements
• To connect to resources on the Internet, client
computers must be able to resolve the DNS
names for servers on the Internet to IP
addresses
• To enable access to Internet resources, ensure
that all client computers can resolve Internet
DNS names
• You can use:
• Internal DNS Server
• External DNS Server
Domain Controller Requirements
• restrict access to Internet resources based
on user accounts
• require authentication before users can
access published servers
• ISA Server provides several options for
authenticating the users
Dynamic Host Configuration
Protocol Requirements
• DHCP is not required to support an ISA
Server infrastructure
• it is highly recommended to simplify
network management.
• The advantage of using DHCP is that it
can provide the IPconfiguration for all the
client computers on your network
automatically. This can make your ISA
Server deployment much more efficient.
Operating System Requirements
• System and Hardware Requirements for ISA Server
2006:
• ISA Server can be installed on standard, Intel/AMDbased server hardware.
Component
Requirement
OS
Windows Server 2003 with SP1
or higher
Processor
Single 733MHz Pentium III
equivalent
Memory 512MB of memory
Disk Space
150MB available (for installation
of ISA software)
Network Cards / ISDN
Adapter / Modem
One OS-compatible card
per connected network
Guidelines for Installing ISA Server,
Standard Edition
• To Configure the ISA Server Network
Interfaces
– The Internal Interface
– Perimeter Network Interfaces
Choosing an ISA Server Client
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ISA Server Client Options
Firewall clients
SecureNAT clients
Web Proxy clients
What Is a Firewall Client
• The Firewall client computer uses the
Firewall Client application when initiating
connections to the ISA Server computer
What Is a Firewall Client
• The advantages of using Firewall clients:
• Firewall clients enable user or group
based access control and logging
• When a Firewall client connects to ISA
Server, the Firewall service automatically
authenticates the user.
• the Firewall Client software can configure
the Web Proxy browser automatically.
What Is a Firewall Client
• Must install the Firewall Client software on
the client computers
• a large number of client computers in
organization and have no means of
automating the client installation, it will
require a significant effort to deploy the
clien
• The Firewall client can only be installed on
Windows computers
What Is a SecureNAT Client
• Do not have Firewall Client software.
• The clients must be able to route requests
for Internet resources through the ISA
Server computer
• configure the default gateway on the
SecureNAT clients and configure network
routing, so that all traffic destined to the
Internet is sent through the ISA Server
computer.
What Is a SecureNAT Client
• When a SecureNAT client connects to the ISA
Server computer, the request is directed first to
the NAT driver, which substitutes the external IP
address of the ISA Server computerfor the
internal IP address of the SecureNAT client.
• The client request is then directed to the Firewall
service to determine whether access is allowed.
• Finally, therequest may be filtered by application
filters and other extensions.
What Is a SecureNAT Client
• SecureNAT clients have other advantages:
• SecureNAT clients also provide almost as much
functionality as Firewall clients
• Requests from SecureNAT clients can be passed to
application filters, which can modify the requests to
enable handling of complex protocols.
• SecureNAT can use the Web Proxy service for Web
access filtering and caching
• Any operating system that supports Transmission
Control Protocol/Internet Protocol
• (TCP/IP) can be configured as a SecureNAT client
What Is a SecureNAT Client
• SecureNAT clients have two primary
limitations
• You cannot control access to Internet
resources based on users and groups
• SecureNAT clients may not be able to use
all protocols
Example
Example
Located on the
Branch Office
Network
The client computers must be configured with Router3 as the
default gateway.
Router3 must be configured with Router2 as the default
gateway.
Router2 must be configured to route Internet requests to
Router1.
Router1 must be configured to route Internet requests to the
ISA Server computer
Located on
Main Office
Network2 or
Main Office
Network1
The client computers must be configured to route all
Internet
requests to Router1.
Router1 must be configured to route Internet requests
to the
ISA Server computer.
What Is a Web Proxy Client?
• A Web Proxy client is a client computer that has
an HTTP 1.1–compliant Web browser
application and is configured to use the ISA
Server computer as a Web Proxy server.
• do not have to install any software to configure
Web Proxy clients.
• must configure the Web applications on the
client computers to use the ISA Server computer
as a proxy server
How to Configure ISA Server for
Web Proxy Clients
• The first step in enabling Web Proxy clients is to
configure the ISA Server computer to allow connections
from these clients.
Configuring Web Proxy Clients
Manually
How to Configure Web Proxy
Clients
Guidelines for Choosing ISA Server
Clients
If You Need To
Then Use
Avoid deploying or configuring
client software
SecureNAT clients
Use ISA Server only for accessing
Web resources using HTTP or
HTTPS
SecureNAT or Web
Proxy clients
Allow access only for
authenticated clients
Firewall clients or Web
Proxy clients
Publish servers that are located
on your Internal network
SecureNAT clients
Improve Web performance in an
environment with non-Windows
operating systems
Web Proxy or
SecureNAT clients
Configuring the SecureNAT and
Web Proxy Clients
• Configuring SecureNAT Clients to Route
Internet Requests
Installing and Configuring the Firewall Client
• How to Install Firewall Client
• Use folder client in ISA server. Run file setup.exe
• To enable Automatic Discovery of the ISA
• Server computer, select Automatically Detect The
Appropriate ISA Server Computer.
Installing and Configuring the Firewall Client
can enable or disable the Firewall Client
and configure it to detect the ISA Server computer automatically or
configure the ISA
Server computer manually.
Installing and Configuring the Firewall Client
• To deploy the Firewall Client to a large
number of clients, choose to automate the
Firewall Client installation.
• Using Active Directory Group Policy to
Distribute the Firewall Client
Securing ISA Server 2006
• defense-in-depth:
• A defense-in-depth security strategy
means that you use multiple levels of
defense to secure your network
Securing ISA Server 2006
• Policies, procedures, and awareness:
• Physical security: Ensure that only authorized personnel can gain
physical access to the resources.
• Perimeter:connecting point between the Internet and the internal
network is as secure as possible, options for providing this security
include firewalls or multiple firewalls
• Internal networks :Even if the perimeter is secure, you must still
ensure thatthe internal networks are secure for cases in which the
perimeter is compromised or when the attacker is within the
organization.
• Operating systems
• Applications
• Data
How to Secure the Network
Interfaces
• To secure ISA Server, begin by securing
the network interfaces connected to the
server.
• Securing the External Network Interface
• Securing the Internal Network Interface
• Using Security Templates to Manage
Services
• Implementing Security Templates
Maintaining ISA Server 2006
• How to Export and Import the ISA Server
Configuration
• Exporting the ISA Server Configuration:
How to Export and Import the ISA
Server Configuration
• Cloning a server : export a configuration from
one ISA Server computer and then import the
settings on another computer
• Saving a partial configuration:export and
import any part of the ISA Server configuration :a
single rule, an entire policy, or an entire
configuration
• Sending a configuration fo troubleshooting
• Rolling back a configuration change
Exporting the ISA Server
Configuration
• The entire ISA Server configuration
• All the connectivity verifiers, or one selected connectivity
verifier
• All the networks, or one selected network
• All the network sets, or one selected network set
• All the network rules, or one selected network rule
• All the Web chaining rules, or one selected Web
chaining rule
• Cache configuration
• All the content-download jobs, or one or more selected
content-download jobs
• The entire firewall policy, or one selected rule
Importing the ISA Server
Configuration
• Open ISA Server Management.
• Select the object whose settings you want to import. You
must select the correct
• type of object for the configuration file that you are using.
• On the Tasks tab, click the import task. The exact name
for the task will vary,
• depending on the type of object that you selected.
• Select the exported .xml file and click Import.
• Click Apply to apply the changes and click OK when the
changes have been
• applied.
How to Back Up and Restore the
ISA Server Configuration
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Open ISA Server Management and click the server name. The option to
back up
and restore the ISA Server configuration is available only when you select
the
server name.
On the Tasks tab, click Backup This ISA Server Configuration.
Enter a file name for the backup file and click Backup.
You must provide a password for the ISA Server backup
To restore the backup, click the server name in ISA Server Management.
Then
click Restore this ISA Server Configuration and select the appropriate ISA
Server
backup file.
Click Apply to apply the changes and click OK when the changes have
been
applied.