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1. Configure the ICS host computer for Internet access. How you set up the ICS host computer depends on whether it uses an analog modem or ISDN connection, or a DSL or cable modem connection to the outside world. 2. Enable Internet Connection Sharing on the ICS host computer to provide Internet access to everyone on the branch intranet. 3. Configure your client computers for dynamic IP addressing. To use the Internet Connection Sharing feature, users on your remote office network must configure TCP/IP on their local area connection to obtain an IP address automatically. ICS provides network address translation, IP address allocation, and DNS name resolution services for all computers on your remote office network or home network that are configured for automatic addressing. The following protocols, services, interfaces, and routes shown in Table 25-5 are configured when you enable Internet Connection Sharing.
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Table 25-5 Item IP address 192.168.0.1 Autodial feature Static default IP route Internet Connection Sharing service DHCP allocator DNS proxy
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Settings for Internet Connection Sharing
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Configuration Configured with a subnet mask of 255.255.255.0 on the network adapter that is connected to the small office/home office network Enabled Created when the dial-up connection is established Started automatically Enabled with the default range of 192.168.0.2 to 192.168.0.254 and a subnet mask of 255.255.255.0 Enabled
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Throughout this chapter, remote office is defined as any home office, branch office, or sole office of a small business connected to either a private network or to the Internet.
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For a detailed scenario about setting up ICS in a branch office network, see ICS Scenario: Connecting Your Branch Office s Intranet to the Internet later in this chapter.
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The computer functioning as your ICS host maintains two connections. At least one of these connections, the one that connects the ICS host computer to the other computers within the remote office, is by means of a network adapter. The other connection, whether by means of a second network adapter or a modem, connects your network to the Internet. You need to ensure that ICS is enabled on the connection that connects your remote office network to the
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25:
Connecting Remote Offices
Internet. As a result, the ICS host computer, through its local network connection, appropriately allocates TCP/IP addresses to its own users; the shared connection connects the network to the Internet; and users outside your remote office network are not at risk of receiving inappropriate addresses from your local network. By enabling ICS on a connection, the ICS host computer becomes a Dynamic Host Configuration Protocol (DHCP) allocator for the remote office network. DHCP distributes IP addresses and other configuration information to users as they start up. If ICS is enabled on the wrong network adapter, users outside your local network might be granted IP addresses by your network DHCP allocator, causing problems on their own networks. There are groups of IP addresses that are specifically reserved for small networks. One of the groups of IP addresses is used by ICS 192.168.0.1 through 192.168.0.254. These addresses are used with a subnet mask of 255.255.255.0. Understanding the IP addressing scheme and using it appropriately can be difficult. The DHCP service enables the ICS host computer to assign IP addresses to its clients automatically. By default, when ICS is installed, the DHCP service begins assigning addresses to computers on the network. Your ISP might use a DHCP service to assign your computer a dynamic IP address when you connect to the Internet. Quite possibly, each time your computer connects to the Internet, a different but unique IP address might be assigned to it. Keep in mind that the DHCP dynamic address assignment, referred to here, does not affect the ICS private adapter, which always has the same address. If your ICS host computer has two adapters one for the device connecting you to the Internet and another for connecting to your remote office network an IP address of 192.168.0.1 is always assigned to the network adapter connected to your network. This address is assigned permanently and is referred to as a static IP address because it does not change. Next, the DHCP client service is loaded into memory so that a dynamic IP address can be assigned to the computer s external adapter by your ISP. Each client computer on your remote office network must request an IP address from your ICS computer. It is important that the ICS host computer remains on all the time or is started prior to starting the other computers on your network. Otherwise, the client computers will be unable to obtain an IP address. For more information about DHCP, see 24, Configuring IP Addressing and Name Resolution. Note
Internet Connection Sharing does not work with some versions of AOL. For more information, contact AOL.
Part IV:
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