Set the default ip address of the second router to be different from that of the first router. For example, if the default ip address of the router you connect to is192.168.1.65438, the default ip address of the router you connect to is192.168.1.2. Do not use dhcp service on the first router. Computers connected to this router are statically configured with ip addresses. Be careful not to forget to set the dns address. The wan port of the added router uses a static ip address, and the address is also within the range of192.168.1.x. Just fill in the subnet mask and dns address completely, and be careful not to conflict with other computer ip addresses. It doesn't matter. The required hardware must first ensure that each computer is equipped with a network card, 100base-tx or 10base-t network card, of any model and size. Note that pci network cards are generally selected, and the speed of each network card should be the same. 100base-tx network card has a high data transmission rate and is suitable for a large number of data transmission, such as digital movies or other large multimedia files. To form a LAN, you need to use a hub, a switch or a router with a built-in hub. The hub is only used to connect all computers to the LAN. If you only have two computers and don't plan to increase the number, you can connect them directly with a line. The disadvantage is that you still have difficulty in trying to share broadband Internet access. If you want multiple computers to access broadband Internet, it is a good idea to use a router. You can buy products from well-known Internet companies such as netgaer, d-link and linksys. Usually, hubs or switches are used in networks. Both devices have separate connectors for connecting each computer to the local area network. The main difference between hubs and switches is throughput. The hub distributes the throughput among all the ports used, so the throughput of each port used by the 4-port 100base-tx hub is only 25mbps. Switches are more expensive, but allow each port to run at full speed. If you want to set up a local area network with only one broadband Internet connection, please make sure that your dsl or cable TV provider provides you with an external modem. Most external modems connect to your computer through a network card. You can set a computer with a modem as a router, but this is not recommended. For example, you plug a phone into a broadband modem and connect it to a hub/switch/router through an rj-45 (twisted pair) cable. From then on, any computer of yours can be connected to the Internet. Set up a windows network to ensure that every computer that you plan to use on the LAN has enough Category 5 cables connected to the hub or router. Now you may have installed the appropriate network card and the corresponding driver. Right-click My Network Places and select Properties to view the currently installed protocols and network cards. To set up the network, you should ensure that the network card you are using has tcp/ip protocol installed. If the Microsoft operating system you are using is windows98 or higher, and the network setup is very simple, windows network should have been installed as one of the basic options of the operating system. If you use windows me on your computer, you can run the Home Networking Wizard, which will guide you through the installation step by step. Remember, you need to set the same group name for every computer in the network. In windows95/98, you need to enter network properties and ensure that all settings are the default settings. Your isp may have told you how to set up tcp/ip and how to connect to the Internet. Depending on your isp, you may have a static ip address or a dynamic ip address. It takes a little longer to set a static ip address. If you want to provide services for Internet users, such as ftp, web server or any other services, static ip addresses are a good choice. If you assign an ip address, your tcp/ip protocol properties should get an automatically selected ip address. To find out whether the hub/router has assigned an ip address to your computer, you can use windows tp configuration (startup type winipcfg) or pcconfig through the command line (windows98/me only). At this point, your computer should have been assigned an ip address, such as 192. 168.0.x, where x is unique to every computer on the network. Depending on the router, the number of your ip addresses may vary, but in general, the last number is a computer-definable number. In the example,192.168.0.1is the ip address of the router (listed as the default gateway in winipcfg). There are two different but easy-to-use methods for broadband connection sharing: nat (address translation) and proxy (proxy server). Both methods require tcp/ip protocol support, which allows your computer to communicate with other computers on the Internet/intranet. Tcp/ip protocol is automatically installed in windows98 or later, and it is easy to install in windows95. For more information, please refer to the windows Help feature. The proxy server is another computer between you and the Internet (controlled by your isp). All information leaving your computer must go through the proxy server first. Although it sounds bad, it is actually good for every subscriber. The proxy server can act as a natural firewall to prevent malicious hackers from breaking into your computer. The proxy server also has the ability to quickly cache frequently visited web pages, and can filter out some content you don't like, such as advertisements and unwanted web pages. Website translation is generally called nat, which is easier to use (or set up) than proxy server. Similar to a proxy server, nat is run by a computer that is actually connected to the Internet. The difference is that nat is based on router/computer, and it usually has no ability to quickly filter or cache web pages. Nat or proxy server can be hardware-based or software-based. In our example, a hardware-based nat router is used. Microsoft provides an example of nat software solution in windows98, which is called Internet connection sharing. Before doing anything, please make sure that you know the dns server address of your current isp and your current host name, and that the router needs to know that these can connect to the Internet through the isp. In this example, the selected router is netgear's rt3 14(nat), so if your local area network is already normal, you usually only need to plug in your cable /xdsl modem to make the Internet work normally on your network. Setting up a router According to the information provided by isp, most router settings and basic functions can be found through the instructional html interface. After the setup is completed, the router should be able to work normally. Log in through the telnet prompt (with >; Run > type telnet), you can change more settings. Unlike the routers provided by netgear, d-link and linksys, you can provide more choices through web configuration, but I personally prefer to use telnet. Setting up software The only software you need to set up at this time is your browser. You only need to set up the browser to connect through the local area network (whether it is ie, Netscape or other browsers). In addition, don't forget to clear the dial-up connection information if your computer is not going to use dial-up connection to access. It is beneficial to set up shared drives, printers and files, so that users on the network can access other users' drives or printers. Verify that your network control panel applet is equipped with file and printer sharing before setting up shared resources. To set up a shared drive, just right-click the files, folders and drives you want to share, and then click Share. It's a good idea to set a password for the resources you want to share through the network, otherwise the network will be risky. Think about the nature of the network (if it is connected to broadband Internet). Hackers may break into your computer and destroy your files. The firewall is not 100% valid.