Configuring Your LAN

You waited weeks for installation day, and the installer finally came. Now all you can think of is all those bits, just waiting to blast their way onto your network. Hang on; we're almost done.

You now need to set up your network's TCP/IP software to let your computers talk through the Internet connection in a coordinated way. This step depends not so much on the connection type you chose but on the sharing system and the IP address system you'll use.

In the following sections, I'll describe how to set up each of the connection schemes diagrammed in Figure 19.1. If you're still in the planning stages for your network, you might want to read all of the sections to see what's involved; this may help you decide what configuration you want to use. If your LAN is already set up and your Internet service is ready to go now, just skip ahead to the appropriate section.

Scheme AMicrosoft Internet Connection Sharing with a Dial-Up Connection

This section shows how to set up the Internet connection method illustrated in Figure 19.1-A.

The Internet Connection Sharing feature provided with Windows XP can share modem, ISDN or broadband connections that require a sign-on procedure. The connection is made automatically whenever any user on the network tries to access the Internet; this is called demand-dialing. The following section describes how to set it up.

Setting Up the Shared Connection

To set up a shared connection, first install and test your modem and ISP information on the computer that will be used to share the connection. To do this, set up a standard dial-up connection using the procedure described in Chapter 8. Be sure that you can access the Internet properly by viewing at least one Web page. When you know this is working, you're ready to set up Internet Connection Sharing. You can do this with the Network Setup Wizard, or set it up manually. To use the wizard, follow these steps:

Click Start, My Computer, select My Network Places, and then select Set Up a Home or Small Office Network.

In the Network Setup Wizard, click Next twice. Select the first choice, This Computer Connects Directly to the Internet, and then click Next.

In the list of network connections, select the listing for the connection to your ISP as shown in Figure 19.4 and click Next. (Your display will not look exactly like the one in the figure, as it will list the dial-up connections you've defined.)

Figure 19.4. In this dialog box, select the ISP Internet Connection that you want to share.

Complete the rest of the Network Setup Wizard as described in Chapter 8. If you have an existing LAN, be sure to enter the same Workgroup name you used originally, as the Wizard wants to change the setting to MSHOME every time you run it.

If you have older Windows 95 or 98 computers on your network, you might want to create a diskette with the Network Setup Wizard for these computers by following the instructions you'll encounter in the wizard.

When the wizard completes, restart your computer.

Log on again, and try to view any Web page (such as www.google.com). Your computer should automatically dial your ISP. If the Web page appears, proceed to step 7. If it doesn't, you'll have to resolve the problem before continuing.

If your modem doesn't dial up when you try to view a Web page, see "Shared Connection Doesn't Happen" in the "Troubleshooting" section at the end of this chapter.

When the sharing computer can connect properly, repeat these steps on your other computers, except for one detail: When you run the wizard, select This Computer Connects to the Internet Through Another Computer on My Network or Through a Residential Gateway.

Connection sharing is now set up. You might want to walk through the manual process described next, just to confirm that all of the settings were made correctly. Otherwise you may skip ahead to the section titled "Configuring the Rest of the Network."

If you don't want to or can't use the Network Setup Wizard on the connection-sharing computer, you can use the manual configuration process described next. Here is the procedure:

1.	Click Start, My Computer, and select My Network Places. Select View Network Connections. Right-click the icon for the connection to your ISP, and select Properties.
2.	Choose the Advanced tab. Check all the boxes, as shown in Figure 19.5. Figure 19.5. On the computer that is going to share its connection, enable Windows Firewall and Internet Connection Sharing.
3.	Select the Options tab. Uncheck Prompt for Name And Password and Prompt for Phone Number. This will let the connection start up without user intervention.
4.	If you want a dedicated, always-on 24/7 connection, make these settings: Check Redial if Line Is Dropped, set the number of Redial Attempts to 99, Time Between Redial Attempts to 10 Seconds, and Idle Time Before Hanging Up to Never. Be aware that if you pay per-minute charges, this may result in an astounding phone bill! Usually, though, you'll want a demand-dialing connection. Make these settings: Uncheck Redial if Line Is Dropped. Set the number of Redial Attempts to 10, the Time Between Redial Attempts to 10 Seconds, and Idle Time Before Hanging Up to 10 Minutes. (I recommend using 10 minutes; you can increase it later if you find that the line disconnects too frequently while you're working.) CAUTION The following step is a crucial part of protecting your computer and LAN from hacking over the Internet. Omitting this step could make your computer vulnerable to hacking.
5.	Select the Networking tab. In the list of Components used by the connection, be sure that only Internet Protocol (TCP/IP) and QoS Packet Scheduler are checked, as shown in Figure 19.6. This will prevent file sharing from being exposed to the Internet. The Firewall will do that too, but it doesn't hurt to be extra safe. Figure 19.6. Be sure that on your Internet connection the Client and Sharing components are not checked.
6.	Click OK. Windows then warns you that it is changing the network address of your LAN adapter to 192.168.0.1. This is now the IP address for this computer on your LAN.

I suggest restarting your computer and confirming that your computer connects to your ISP when you try to view a Web page. Then, proceed by configuring the other computers on your LAN.

Configuring the Rest of the Network

When the shared connection is set up, configuring the rest of your LAN should be easy. The computer sharing its Internet connection is now running the Internet Connection Sharing service, which makes it

A DHCP server, which parcels out IP addresses and setup information
The network gateway, which forwards to the Internet any network traffic that isn't directed at local computers
A DNS server, which assists the other computers in converting domain names into IP addresses

Its IP address is 192.168.0.1 and all your other computers simply refer to it for network services.

To configure the other computers on the network, you can use the Network Setup Wizard, or configure manually. First, I'll give the steps for using the wizard. On each of your other computers (all except the connections-sharing computer), follow these steps:

1.	Open My Computer from the Start Menu, and select My Network Places. Select Set Up a Home or Small Office Network. If you are setting up older Windows 95/98/2000 computers that don't have a Network Setup Wizard, you can use the diskette you prepared when you setup connection sharing.
2.	When the wizard starts, click Next twice. Select This Computer Connects to the Internet Through Another Computer as the connection method, and then select Next.
3.	Complete the rest of the Network Setup Wizard as described in Chapter 16, under "Give This Computer a Description and Name." If you have an existing LAN, be sure to enter the same Workgroup name you used originally, because the wizard wants to change the setting to MSHOME every time you run it.
4.	When the wizard finishes, you might want to restart your computer. Then, you should be able to open Internet Explorer and view a Web site. When you try, the connection-sharing computer should dial out.

NOTE

When you're using a shared dial-up connection, it takes a while for the dialer to go through its paces if the connection wasn't already up, and before it can finish you might get an error from Internet Explorer saying it can't open the page. If this happens, just wait a few seconds and click Refresh to try again.

If you are using Microsoft Internet Connection Sharing, or a connection sharing router that supports Universal Plug and Play (UPnP), the Network Connections window of all of the other computers on your network should have an icon that represents the shared Internet connection, as shown in Figure 19.7. Normally, Windows will automatically establish and drop the shared connection as needed. If necessary you can right-click this icon to control the connection manually (unless the owner of the shared connection disabled the remote-control feature on the shared connection's Advanced properties page).

Figure 19.7. The other computers on your network can control the shared connection from their Network Connections window.

If you're a networking hotshot and want to configure other computers manually, you can use this procedure:

1.	Open My Network Places and select View Network Connections. Open Local Area Connection's Properties. On versions of Windows other than XP, you may have to use different selections to get to your network adapter's settings; check online help or your copy of the corresponding Special Edition Using book.
2.	Select Internet Protocol (TCP/IP), and then select Properties.
3.	Check Obtain an IP Address Automatically and Obtain DNS Server Address Automatically.
4.	Click OK. The computer should reconfigure itself with a new IP address obtained from the computer with the shared dial-up connection.

Now test the shared connection from a computer on your LAN by trying to browse a Web page.

If the computer can't browse Web pages, see "Can't Access a Shared Modem Connection from the LAN" in the "Troubleshooting" section at the end of this chapter.

If you want to make services available to the Internet, continue with "Making Services Available" later in this chapter.

Scheme BMicrosoft Internet Connection Sharing with a Broadband Connection

This section shows how to set up the Internet connection method illustrated in Figure 19.1-B.

The procedure for configuring a shared high-speed cable or DSL Internet connection with Microsoft ICS is very similar to that for setting up a shared dial-up connection. To prepare, be sure to install and test your DSL or cable connection on the computer you'll use to host the shared connection, as described in Chapter 8. It's essential that you have this working before you proceed to set up your LAN and the shared connection.

TIP

If your broadband service uses a LAN adapter rather than USB to connect your computer to the DSL or cable modem, you'll be installing two LAN adapters in this computer: one for the LAN, and one for the modem. I suggest that you install them one at a time. Install the one that you'll use for your broadband connection first. View the adapter's icon in Network Connections, right-click it, and rename it "DSL Connection" or "Internet Connection," or some other name that indicates what it's used for, as shown in Figure 19.8. Configure and test the Internet connection. Then, install the network adapter that you'll use to connect to your LAN. Rename this connection "LAN Connection" or leave it as "Local Area Connection." This will help you later on in the setup process when you need to know which connection goes to your ISP.

Figure 19.8. Install and rename your network adapters one at a time, indicating what purpose they'll serve. "DSL Connection" or "Internet Connection" is much more informative than "Local Area Connection #2."

Verify that the broadband Internet connection is not connected to Windows file and printer sharing. To do this, follow these steps:

1.	Open the Network Connections window by clicking Start, My Network Places, and selecting View Network Connections.
2.	Right-click the icon that corresponds to your broadband connection and select Properties. Be sure that only QoS Packet Scheduler and Internet Protocol (TCP/IP) are checked, as shown in Figure 19.6.

When your broadband connection is configured correctly and is working, follow these steps:

1.	Click Start, My Computer. Select My Network Places, then select Set Up a Home or Small Office Network.
2.	In the Network Setup Wizard, click Next twice. Select This Computer Connects Directly to the Internet as the connection method, and then click Next.
3.	In the list of network connections, select the listing for the connection to your ISP as shown in Figure 19.9 and click Next. (Now you see why it's helpful to have renamed the connection icons. Also, note that your list of connections might not look exactly like mine.) Figure 19.9. In this dialog box, select the network connection that corresponds to your broadband connection.
4.	Complete the rest of the Network Setup Wizard as described in Chapter 8. If you have an existing LAN, be sure to enter the same Workgroup name you used originally, because the wizard wants to change the setting to MSHOME every time you run it. If you have older Windows 9x or Me computers on your network, you might want to create a diskette with the Network Setup Wizard for these computers by following the instructions you'll encounter in the wizard.
5.	When the wizard completes, you might want to restart your computer.
6.	Log on again, and try to view any web page (such as www.google.com). If it appears, proceed to step 7. If it doesn't, you'll have to resolve the problem before proceeding. You should check the appropriate connection icon to be sure it's still configured correctly for your ISP.
7.	When the sharing computer can connect properly, repeat these steps on your other computers, except for one detail: when you run the wizard, select This Computer Connects to the Internet Through Another Computer on My Network or Through a Residential Gateway.

When Connection Sharing has been set up, follow the instructions under "Configuring the Rest of the Network" in the section immediately preceding this one.

Because it's so important with these always-on broadband connections that Windows Firewall is actually working, I suggest that you view the icons in Network Connections to be sure that at least the broadband connection icon has the word "Firewalled" next to it, as shown in Figure 19.10. If it doesn't, use the following manual configuration steps to set it up.

Figure 19.10. Be sure that your shared broadband connection says Firewalled.

If you want to confirm that the wizard did its job properly, or if you want to configure Connection Sharing manually, rather than using the wizard, you can follow these steps on the computer with the broadband connection:

1.	Locate the icon for the adapter that goes to your broadband modem in Network Connections. Right-click it and select Properties.
2.	Choose the Advanced tab. Check all of the boxes, as shown in Figure 19.5.
3.	Select the General tab. In the list of Components used by the connection, be sure that only Internet Protocol (TCP/IP) and QoS Packet Scheduler are checked. (This will prevent file sharing from being exposed to the Internet. Windows Firewall will do that too, but it doesn't hurt to be extra safe.)
4.	Click OK. Windows then warns you that it is changing the network address of your LAN adapter to `192.168.0.1`. This is now the IP address for this computer on your LAN.
5.	Select Change Windows Firewall Settings in the Network Tasks list. Be sure that Windows Firewall is On, and that Don't Allow Exceptions is unchecked.

I suggest restarting your computer and confirming that your computer connects to your ISP when you try to view a Web page. Now, skip back to the section titled "Configuring the Rest of the Network" on page xxx.

Scheme CSharing Router with a Broadband or Dial-Up Connection

This section shows how to set up the Internet connection method illustrated in Figure 19.1-C.

Your router's manufacturer will provide instructions for installing and configuring it. If you're using cable or DSL Internet service, you'll connect your broadband modem to the router using a short Ethernet patch cable. If you're using a dial-up or ISDN account, you'll need to set up the router and a modem. Then, you'll connect the router to your LAN using one of the two methods shown in Figure 19.11.

Figure 19.11. Connecting a connection sharing router to your LAN.

If you connect your router to a separate hub, be sure that the "Link" indicators come on at both the hub and the router. If they don't you might need to switch the hub end of the cable from a regular port to an uplink port or vice versa.

You'll then configure the router, telling it how to contact your ISP, and what range of IP addresses to serve up to your LAN. Every device will use a different procedure, but I can show you the basic steps used by the Linksys Cable/DSL Sharing Routers that I have been so happy with.

The procedure will go something like this: When the router is attached to your network, you'll set up one of your computers' LAN adapter to obtain its IP address information automatically. Then you will use Internet Explorer to connect to the router by viewing http://192.168.1.1. (The address may be different for your router.) A password is required; on my router the factory default value was admin. (On some routers you have to enter both a username and a password.)

You'll fill in your ISP's IP and sign-on information, if any, on a Web page similar to the one shown in Figure 19.12.

Figure 19.12. Sample setup page for a cable/DSL connection sharing router.

You might need to enter a static IP address, if one was assigned to you by your ISP. If your ISP uses DHCP to assign IP addresses dynamically, the router may need to be assigned the host and domain name expected by your provider. This is common with cable Internet setups.

If your ISP uses PPPoE to establish a connection, you'll need to enable PPPoE and enter your logon and password. Most DSL service works this way. If your DSL provider does use PPPoE, you should enable the router's auto-sign-on feature, and you can optionally set up a "keep-alive" value that will tell the modem to periodically send network traffic even if you don't, in order to keep your connection active all the time. (This might violate your service agreement with the DSL providerbetter check before you do this.)

If you use cable Internet service and your ISP didn't provide you with a special host name that you had to give to your computer, your ISP probably identifies you by your network adapter's MAC (hardware) address. You'll probably find that your Internet connection won't work when you set up the router. One of your router's setup pages should show you its MAC address. You can either call your ISP's customer service line and tell them that this is your new adapter's MAC address, or, you can configure the router to "clone" your computer's MAC address, that is, copy the address from the computer you originally used to set up your cable connection. Your router's setup manual will tell you how to do this.

CAUTION

Be sure to change the factory-supplied password of your router after you install it. (And write the password down somewhere in the router's manual.) Also, be sure to disable outside (Internet) access to the router's management screens.

As you are configuring your router, you may wish to enable Universal Plug and Play (UPnP). I'll discuss this later in this chapter.

You may also opt for even better hacker protection by having your router filter (block) Microsoft file and printer sharing data. This is usually done on an advanced set up screen labeled Filtering. See "Scheme FRouted Service Using a Router" later in this chapter for the list of ports that you must block.

When the router has been set up, go to each of your computers and follow the instructions under "Configuring the Rest of the Network," on page 752. You can configure all of the computers manually, or you can use the Network Setup Wizard. If you use the wizard, select My Computer Connects Through Another Computer or a Residential Gateway. If you set up the computers manually, select Obtain an IP Address Automatically and Obtain DNS Information Automatically.

Using Universal Plug and Play

If you use a hardware connection sharing router, you may want to consider enabling a feature called Universal Plug and Play (UPnP). UPnP provides a way for software running on your computer to communicate with the router. Here's what UPnP can do:

It provides a means for the router to tell software on your computer that it is separated from the Internet by Network Address Translation. Some softwareRemote Assistance and the video and audio parts of Windows Messenger in particularask the computer on the other end of the connection to establish a connection back to your IP address. On a network with a shared connection, however, the IP address that the computer sees is not the public IP address that the shared Internet connection uses. UPnP lets software like Remote Assistance find out what its public IP address is. It also provides a way for the router to suggest alternate port numbers if several computers on the network want to provide the same service (for example, if several users send Remote Assistance requests).
It provides a means for software running on the network to tell the router to forward expected incoming connections to the correct computer. Remote Assistance and Windows Messenger again are two good examples. When the computer on the other end of the connection starts sending data, the router would not know to send it to your computer. UPnP lets UPnP-aware application programs automatically set up forwarding in the router.
UPnP provides a means for other types of as-yet-undeveloped hardware devices to announce their presence on the network, so that Windows can automatically take advantage of the services they provide.

UPnP has a downside, howeverit has no built-in security mechanism, so any program on any computer on your network could potentially take control of the router and open "holes" for incoming connections. (I am confident that we will soon see computer viruses and Trojan Horses that take advantage of this.) However, Windows Firewall will still provide some protection and will warn you if an undesired program attempts to receive incoming network connections, so this is not yet a serious problem. If you use Remote Assistance or Windows Messenger, the benefits that UPnP provides outweigh the risks.

To use UPnP, you must enable the feature in your router. It's usually disabled by default. If your router doesn't currently support UPnP, you may have to download and install a firmware upgrade from the manufacturer. Most routers now do support UPnP.

By default, Windows XP provides support for detecting UPnP enabled routers. If you have a UPnP router or Windows Internet Connection Sharing running on your network, the Network Connections screen should display an icon for the router as shown in Figure 19.13.

Figure 19.13. If your router supports UPnP, an Internet Gateway icon should appear in Network Connections.

NOTE

If the icon doesn't appear, click Advanced, Optional Networking Components, select Networking Services, and click Details. Be sure that Internet Gateway Device Discovery and Control Client is checked. While you're here, check UPnP User Interface as wellthis enables support for future UPnP devices.

Then, on the task list, click Change Windows Firewall Settings. View the Exceptions tab and be sure that UPnP Framework is checked.

If you right-click the Internet Connection icon and select Status, you'll see a dialog similar to the one shown in Figure 19.14, displaying the status of the router's connection. If your Internet service uses a connection-based system like PPPoE or standard dial-up service via a modem, this dialog may display a buttons that let you connect to and disconnect from your ISP.

Figure 19.14. Router Status displayed via UPnP.

Click Properties and then Settings to display a list of network services for which the router is forwarding incoming connections to computers on your network. This list shows only forwarding settings made via UPnP. Services forwarded by the setup screens on your router, a process discussed later in this chapter under "Making Services Available," do not appear here and new settings need not be made herethey may disappear when the router is reset.

Scheme DCable Internet with Multiple Computers

This section shows how to set up the Internet connection method illustrated in Figure 19.1-D. As I mentioned earlier in the chapter, you cannot safely use file and printer sharing with this setup. You would only use this setup if you don't want file and printer sharing at all, and just want to have several computers with Internet access.

Here is the procedure to follow:

1.	If your computers do not already have LAN adapters, install a network adapter in each of your computers. Configure the adapters as instructed by your ISP. In most cases, you won't need to make any adjustments to the default settings.
2.	Connect your computers and your cable modem to an Ethernet hub. Chapter 16 provides details on installing network wiring.
3.	On each computer, run the Network Setup Wizard. Click Next twice.
4.	On the Select a Connection Method screen, select Other and click Next. Select the first choice, This Computer Connects to the Internet Directly or Through a Network Hub. Click Next.
5.	If your ISP has given you a specific name to use with each computer, enter it in the Computer Name field. Otherwise, provide your own name and click Next.
6.	Leave the workgroup name set to MSHOME and click Next.
7.	Select Turn Off File and Printer Sharing and click Next.
8.	Confirm the settings and click Next. Select Just Finish the Wizard and click Next.
9.	When the wizard finishes, don't have it restart your computer right away. Instead, open the Network Connections window, right-click the Local Area Connection icon, and uncheck the Client and Sharing items, as shown in Figure 19.6. Click OK, and then restart Windows.

If you later decide that you want to use file and printer sharing, do not simply enable the Client and Sharing items. Instead, set up a shared connection using schemes B or C, or install a second LAN as described in the next section.

Scheme ECable Internet with Multiple Computers and a Separate LAN

This section shows how to set up the Internet connection method illustrated in Figure 19.1-E. If you want to have file and printer sharing and have multiple computers on a cable Internet connection but for some reason do not want to use a connection sharing setup, you must set up a second, private network for file sharing that is physically separate from the network used for the Internet connection.

To do this, set up and test the LAN for the cable service as described in the previous section. Then, on each of the computers that is to participate to file and printer sharing, perform the following steps:

1.	View the Network Connections screen, right-click the icon that corresponds to the network adapter, and select Rename. Change the name to "Internet Connection."
2.	Shut down the computer and install a second network adapter. Connect this adapter to a separate network hub.
3.	Run the Network Setup Wizard again. Make the same choices, except this time turn on file and printer sharing.
4.	On the Network Connections window, right-click the Internet Connection icon, select Properties, and be sure that it is still configured as shown in Figure 19.5.
5.	Right-click the Local Area Connection icon (which corresponds to your new, second network), select Properties, and be sure that all of the component items are checked. You also might want to assign each computer a static IP address. To do this, select Internet Protocol and click Properties. Click Use The Following IP address. For the first computer, enter `192.168.0.1`. Set the Network Mask to `255.255.255.0` and leave the Default Gateway address blank. Leave the DNS setting on automatic. For the second computer, enter address `192.168.0.2`, and so on.
6.	In the Network Tasks list, select Change Windows Firewall Settings. Be sure the firewall is set On.
7.	On the Exceptions tab, check File and Printer Sharing. Click OK to close the dialog.

Now, file and printer sharing will use your second, private LAN while the first LAN is used only for Internet service.

Scheme FRouted Service Using a Router

This section shows how to set up the Internet connection method illustrated in Figure 19.1-F.

Some Internet service providers will sell you service that provides multiple, fixed IP addresses. This is the case for all frame relay service, and in some cases, higher-priced business-class DSL service. You should really have a good reason for going this way, beyond just wanting to connect multiple computersit's not as secure as a single shared connection. Good reasons might be that you want the reliability of frame-relay service, or you need fixed IP addresses in order to host Web, email, or other Internet-based services on several different computers.

For this type of service, if you are using a cable, DSL, satellite, or Frame Relay modem with a built-in router, your ISP will help you configure your network. In this setup, you will be provided with a fixed set of IP addresses, which you'll have to parcel out to your computers. Your ISP should help you install all of this, but I can give you some pointers.

First of all, it is absolutely essential that your router be set up to protect your network. You must ensure that at least these three items are taken care of:

The router must be set up with filters to prevent Microsoft file sharing service (NetBIOS and NetBT) packets from entering or leaving your LAN. In technical terms, the router must be set up to block TCP and UDP on port 137, UDP on port 138, and TCP on ports 139 and 445. It should "drop" rather than "reject" packets, if possible. This helps prevent hackers from discovering that these services are present but blocked. Better to let them think they're not there at all.
Be absolutely sure to change your router's administrative password from the factory default value to something hard to guess, with uppercase letters, lowercase letters, numbers, and punctuation. Don't let your ISP talk you out of this, but you should let them know what the new password is so they can get into the router from their end if need be.
Disable SNMP access, or change the SNMP read and read-write "community names" to something other than the default. Again, use something with letters, numbers, and punctuation.

CAUTION

If your router is not properly configured to filter out NetBIOS traffic, your network will be exposed to hackers. This is absolutely unacceptable. If you're in doubt, have your ISP help you configure the router. Also, after setting things up, visit http://www.grc.com and use the "Shields Up!" pages there to be sure your computers are properly protected.

For more information about network security please see Chapter 21.

Second, you'll need to manually set up a fixed IP address for each computer that is to host a service reachable from the "outside." You can make address settings manually in all of your computers, or just the ones that are hosting services, with your router providing DHCP service to configure the other computers.

Make a list showing the name of each computer that is to get a static IP address, and the IP address you want to assign. You'll also have to manually enter the network mask, gateway IP address, and DNS server addresses supplied by your ISP, on each of these computers.

Follow these steps on each computer that is to get manual settings:

1.	View My Network Places and select View Network Connections.
2.	Right-click the Local Area Connection icon and select Properties.
3.	Select the General tab, select Internet Protocol (TCP/IP), and then click Properties.
4.	Enter an IP address and other assigned information. Figure 19.15 shows an example; you'll have to use the information provided by your ISP. Figure 19.15. Setting up static assigned IP address information.

Finally, be sure to run the Network Setup Wizard on every one of your computers, however configured. When asked to choose a connection method, select Other, and on the next page, choose This Computer Connects to the Internet Directly or Through a Network Hub.

The wizard will give you some grief about the security risk involved in your Internet setup and will enable Windows Firewall on your LAN adapter. Don't let it disable File and Printer sharingleave it turned on.