Lesson 3 in Visual C#

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Lesson 3
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Configuring Virtual Private Networking for Remote Sites
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The second system policy rule that is created is Allow VPN Site-To-Site Traffic From ISA Server. This policy rule allows all VPN tunneling protocols from the Local Host network to the external network and to a computer set named IPSec Remote Gateways. IPSec Remote Gateways is a computer set, defined in advance, that cannot be modified. When an IPSec site-to-site network is added, the IP address configured as the remote tunnel endpoint is added to the IPSec Remote Gateways computer set.
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Configuring Network Rules for Remote-Site Networks
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After you have created the remote-site network, ISA Server views it as it does any other network connected to the computer running ISA Server. This means that you need to create a network rule establishing whether the network has a NAT or route relationship with the other networks connected to the computer running ISA Server. You should establish a route relationship between the remote-site network and the internal network if two-way communication is required. If the computers that must communicate across the various networks have public IP addresses, a route relationship can be created without concern about address duplication, because public IP addresses are unique. When the computers have private IP addresses, there is a risk that there will be duplicate addresses across the VPN networks. You must ensure that there is no duplication of IP network numbers between the computers that have to connect across the two VPN networks, so that a route relationship can be established.
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Configuring Access Rules for Remote-Site Networks
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After you create the remote-site networks, you also need to configure access rules to regulate traffic between the remote site and the other networks connected to your computer running ISA Server. You can use any access rule or publishing rule to configure access. There are two high-level options: you can allow all network traffic between the sites, or you can allow only selected network traffic between the sites. Open Communication Between Networks One option is to configure the branch office to have full access to the internal network. To enable full access, create an access rule allowing all traffic from the remote-site network to the internal network. You also need to create an access rule that enables all network traffic to flow in the other direction. Controlled Communication Between Networks In some situations, you may not want the branch office users to have complete access to the internal network but want to limit access based on users, computers, or traffic destination. For example, you may want to create a firewall policy that allows the following types of communication:
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Some users will have full access to the internal network of the main office, while others have limited access. Specific users will have access to an application server on the internal network of the main office.
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10
Configuring Virtual Private Networks for Remote Clients and Networks
All users will have access to the computer running Microsoft Exchange Server on the internal network of the main office. The domain controller in the branch office will communicate with the domain controller in the main office, so that users from the branch office can be authenticated for access to the computer running Exchange Server in the main office.
Follow these general steps to create this firewall-access policy:
Create computer sets representing the client computers who will have differing access rights. Where there is only one computer, such as a single domain controller, you can create a computer object rather than a computer set. Create computer objects representing the computers that users will have access to on the internal network of the main office. In this example, you will need computer objects for the application server, one for the computer running Exchange Server, and one for the internal domain controller. Where there is more than one server providing the same network services, such as two computers running Microsoft SQL Server, create a computer set rather than a computer object. Create an access rule allowing all traffic for the users who need full access to the internal network of the main office. Create an access rule allowing application-specific network traffic from the application user computer set to the application server on the internal network of the main office. Publish Exchange Server on the internal network of the main office, using the Exchange Server remote procedure call (RPC) protocol. Create an access rule allowing Lightweight Directory Access Protocol (LDAP), LDAP (UDP), LDAPS, LDAP GC, LDAPS GC, DNS, Kerberos (TCP), and Kerberos (UDP) traffic from the remote-site domain controller to the internal domain controller of the main office.
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