c# qr code generator source Assigning IP Addresses to VPN Clients in C#.NET

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Assigning IP Addresses to VPN Clients
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When VPN clients connect to ISA Server, the client must be assigned an IP address. There are two ways that ISA Server can assign the addresses:
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Dynamic address assignment To enable dynamic address assignment, a DHCP server must be accessible from the computer running ISA Server. Any computer running Windows Server 2003 or Windows 2000 Server on the internal network can serve as the DHCP server. If you use a DHCP server for address assignment, ISA Server retrieves a group of available IP addresses from the DHCP server. When a VPN client connects, ISA Server assigns one of these addresses to the VPN client. As part of the IP address assignment, ISA Server also assigns other TCP/IP properties such as the Domain Name System (DNS) servers and Windows Internet Naming Service (WINS) servers. The IP address assigned to the client is automatically moved from the internal network to the VPN Clients network (or Quarantined VPN Clients network if quarantine is enabled and the client is quarantined). Static address assignment You can also configure ISA Server with a static pool of addresses to assign to VPN clients. In this configuration, you do not need a DHCP server; rather, you configure the IP addresses on the computer running ISA Server. When a client connects, ISA Server assigns one of the IP addresses to the VPN client. If you use a static address pool for address assignment, the addresses that you want to assign to the pool must first be removed from other defined networks, because overlapping of IP addresses between networks is not allowed. You must also provide one more IP address in the static address pool than the expected number of remote VPN connections because the VPN interface on ISA Server requires an IP address.
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Tip If you try to configure static IP addresses for VPN clients that are part of the Internal network, you will receive an error message indicating that the address ranges are overlapping. You can address this error by removing the required addresses from the Internal network, or by using a different address range. For example, if your Internal network includes all addresses 10.10.0.0 to 10.10.255.255, you can remove the IP addresses from 10.10.255.0 to 10.10.255.255 from the Internal network and then assign those to VPN clients. Or you can configure a static IP address range for VPN clients on the 10.11.0.0 network.
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Configuring Virtual Private Networks for Remote Clients and Networks
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Configuring IP Address Assignment
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To configure ISA Server to assign IP addresses, complete the following procedure: 1. In the ISA Server Management Console, click Virtual Private Networking. 2. On the Tasks tab, click Define Address Assignment. 3. On the Address Assignment tab, as shown in Figure 10-5, select one of the following options:
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Static Address Pool To assign static addresses to the remote VPN gateway or the remote VPN clients. If you select Static Address Pool, click Add to specify the IP address range. In the IP Address Range Properties dialog box, in Starting Address, type the first address in the range of addresses to assign to the VPN clients. In Ending Address, type the last address in the range of addresses to assign to the VPN clients. Dynamic Host Configuration Protocol To assign addresses dynamically to the remote VPN gateway or the remote VPN clients.
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Figure 10-5 Configuring VPN IP addresses for VPN clients
4. In the Use The Following Network To Obtain DHCP, DNS, And WINS Services drop-down list, select the network on which the name-resolution servers are located. In most cases, this will be the Internal network.
Lesson 2
Configuring Virtual Private Networking for Remote Clients
10-23
5. To configure the DNS and WINS server IP addresses that will be assigned to VPN clients, click Advanced, as shown in Figure 10-6. By default, the DNS and WINS servers assigned by DHCP are also assigned to VPN clients, but you can modify this so that ISA Server assigns alternate DNS and WINS server addresses for VPN client connections only.
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