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for configuring the subnet mask, the default gateway, and addresses for DNS and WINS servers. An individual IP address from the range, and the options associated with that range, are assigned dynamically to any DHCP client requesting an address. If DHCP is available company-wide, users can move from subnet to subnet and always have a valid IP address. DHCP permits the administrator to assign a lease time that defines how long an IP address configuration remains valid. A Microsoft Windows NT version 3.5 or later or a Windows 2000 based server running the DHCP service, or any computer or network device running RFC 2131 compliant software, can act as a DHCP server. For more information about installing and configuring the DHCP service in Windows 2000, see Dynamic Host Configuration Protocol in the Networking Guide of the Microsoft Windows 2000 Server Resource Kit.

The first time that a Windows XP Professional based client (with DHCP enabled) attempts to join a network, it automatically follows an initialization process to obtain a lease from a DHCP server. Figure 24-1 shows the lease process.

IP lease request IP lease offers IP lease selection DHCP Client IP lease acknowledgment DHCP Servers

In addition to basic hubs and switches, you ll find plenty of router or residential gateway devices on sale in the networking section of most computer stores. In the past, these devices were not needed for small networks, but with Internet connection sharing of Digital Subscriber Line (DSL) and cable Internet connections, these devices can be quite useful. Both can manage the connection between your network and other networks, such as the Internet, and some come with additional features that can enhance security. A router manages traffic entering and leaving the network from the Internet or other network segments. It maintains internal tables that guide it in determining how to forward outbound traffic to remote destinations and inbound traffic to systems on the local network segment. The default gateway address configured for most TCP/IP configurations, as discussed in 2, Configuring TCP/IP and Other Protocols, normally points to the address of a router. A residential gateway, on the other hand, is a router with additional features that are quite useful in most home and small office networks. Residential gateways typically combine the features of a router, a hub or switch, a firewall, a network address translation device (described below), and often a Dynamic Host Configuration Protocol (DHCP) server. Some residential gateways even have built-in wireless access points. So how does a router or residential gateway work, and do you need one A router or residential gateway is designed to be placed between the Internet and your LAN. The following illustration shows how the router or residential gateway provides the connection from your LAN to your DSL or cable modem.

Figure 24-1

The lease process involves the following steps: 1. The Windows XP Professional DHCP client requests an IP address by broadcasting a message (known as a DHCPDiscover message) to the local subnet. 2. The client is offered an address when a DHCP server responds with a DHCPOffer message containing an IP address, and associated configuration information, available for lease to the client. 3. The client selects the offered address and replies to the server with a DHCPRequest message. 4. The client is assigned the address, and the DHCP server sends an acknowledgment message (DHCPAck) approving the lease. Other DHCP option information, such as default gateway and DNS server addresses, might be included in the message. 5. After the client receives acknowledgment, it configures its TCP/IP properties using any DHCP option information in the DHCPAck message and completes the initialization of TCP/IP.

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I ll now explain the previous code a little. The Click event handler essentially displays the Navigate dialog box, and if the user clicks OK, it tries to navigate to the URL specified by the user. I am sure you saw that this is a little different from the Windows Forms technique you used previously in this chapter. 6. Add the code for the NavigateToUrl method:

If no DHCP server responds to the client request, the Windows XP Professional based client can proceed in one of two ways: