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In these cases, the Windows XP Professional client selects an IP address from the range of IANAdesignated, private class B addresses (169.254.0.1 through 169.254.255.254) with the subnet mask 255.255.0.0. The client performs duplicate-address detection to ensure that the IP address that it has chosen is not already in use. If the address is in use, the client will select another IP address up to 10 times. After the client has selected an address that is verifiably not in use, it configures the interface with that address. In the background, the client continues to check for a DHCP server every five minutes. If a DHCP server is found, the APIPA autoconfiguration information is abandoned and the configuration offered by the DHCP server is used instead. You can use the Ipconfig.exe command-line tool to determine whether APIPA is enabled. To determine whether Automatic Private IP Addressing is currently enabled

G The more important benefit of a residential gateway is security. Most resi-

The resulting text identifies your IP address and other information. Check the line that reads Autoconfiguration Enabled. If the text reads YES and the IP address is in the 169.254.0.1 through 169.254.255.254 range, Automatic Private IP Addressing is enabled. You can disable automatic private IP addressing in one of two ways:

Manually configure TCP/IP. This method also disables DHCP. For information about manually configuring TCP/IP, see Configuring an IP Address Manually later in this chapter. Disable automatic private IP addressing (but not DHCP) for a particular network interface by editing the registry.

Do not edit the registry unless you have no alternative. The Registry Editor bypasses standard safeguards, allowing settings that can damage your system or even require you to reinstall Windows. If you must edit the registry, back it up first.

dential gateways provide security through a combination of firewalls and network address translation. Firewalls block outside networks from sending traffic to the devices they protect, limiting even response traffic to that specifically requested via outbound connections from systems behind the firewall. Many firewalls block any traffic that crosses them, other than traffic to and from specified addresses or to and from systems using virtual private network (VPN) tunnels. You can read more about firewalls in 5, Using Internet Connection Firewall. Network address translation (NAT) is a feature originally designed to extend IP networks that also provides a form of security by hiding the internal IP addresses of a LAN from the Internet (or other destination of the residential gateway). NAT translates the internal IP addresses of the LAN to a different IP address range. These addresses are then used for communications on the Internet. If a hacker decides to break into your network, he or she must have the real IP address of a computer on your LAN, and with NAT, those IP addresses are not visible. Therefore, any hacker attacks using IP addressing schemes simply fall apart at the residential gateway because the IP address (of the residential gateway) that allows the hacker to access your residential gateway is not the IP address that any of the machines on your LAN are using; so, the hacker is stopped at the gateway. Of course, not all routers and residential gateways provide this service, but it is common to most of them. As an example, Linksys (www.linksys.com), 3Com (www.3com.com), and NetGear (www.netgear.com) provide several different kinds of residential gateways that all perform the same tasks but provide different features. You ll find these same features in other manufacturers models as well.

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To disable APIPA for a particular network interface by editing the registry 1. You do this by adding the registry entry IPAutoconfigurationEnabled with a value of 0 (REG_DWORD data type) in the following subkey: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\ Parameters\Interfaces\interface-name 2. Use the Registry Editor Regedit.exe to add the above entry, and then restart the computer. To disable APIPA for multiple adapters by editing the registry 1. Set the value of the IPAutoconfigurationEnabled entry to 0x0 (REG_DWORD data type) in the following registry subkey: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\ Parameters 2. Use the Registry Editor Regedit.exe to add the above entry, and then restart the computer.

If you cannot use DHCP or APIPA for IP address and subnet assignment, the IP address for the Windows XP Professional based client must be manually configured. The required values include the following: