Methods and comparison of LAN Internet sharing

To allow multiple computers to access the Internet by sharing an account or an IP address, connect the computers that want to access the Internet to a LAN through a hub: each computer in the LAN is installed with a nic, add and configure the TCP/IP protocol, assign a fixed IP address, and then take out a computer with better performance in the LAN for use on the server, the server must add a second Nic, set the IP address to the IP address provided by the ISP. Note that in the IP Address Configuration of the client computer, the gateway should be set to the IP address of the first Nic of the server, and The DSN should be set to the dns ip Address Provided by the ISP; set the browser to never make a dial-up connection. You can use a LAN connection.

1. Third-party software access

Currently, third-party software is mainly used for shared Internet access for users in Small Lan: proxy server and gateway ). The agent server software is easy to install and set, and easy to use, so that users can access the Internet quickly. The Gateway Software is generally relatively large and must act as a gateway (Protocol converter, the speed at which users access the Internet is also affected. The installation is relatively cumbersome and the number of applications is relatively small. However, gateway software can act as a network firewall, it is also unable to compare with a single proxy server software.

Depending on the software requirements, some software only needs to be installed on the server or on the computer on the server and client. You can set different settings according to the functional requirements of the Internet connection mode.

Common third-party software, such as Wingate and Sygate, has many functions. In particular, the firewall function can separate internal information from external information and filter through the firewall, it protects computer data within the LAN. Therefore, it is suitable for LAN shared Internet access with large traffic and high requirements on intranet data security.

2. Share a connection with a Windows Operating System

Internet Connection Sharing is integrated in Windows 98 SE, Windows ME, and Windows2000. Set the server-side Internet connection as a proxy service (Internet Connection Sharing) according to the system prompt. When the client wants to access the Internet, it first sends a request to the proxy server and transfers the connection through the proxy server, send requests out, and external data must also be transferred through the proxy server to obtain the required information.

Internet Connection Sharing has a single function and does not provide protection for the Intranet. It poses a great threat to network security and is only applicable to users with small network size and low security requirements.

3. Use the network address translation function of Windows 2000 Server (NAT)

Vrouters can convert data packets between the LAN and the Internet, and effectively protect computers in the LAN. The Network Address Translation of Windows 2000 server implements the software routing function. On the server where Windows 2000 Server is installed, install and set the Routing and Remote Access functions, and complete the settings as prompted.

If the DHCP function of the Windows 2000 Server server is used, the IP address of the computer in the LAN can be set to dynamic IP and automatically obtained, thus reducing the burden of network management and maintenance. Therefore, network address translation is more suitable for Windows2000 Server/advance server LAN with complicated configurations.

4. share data directly through a hardware Router

Connect the WAN end of the router to the Internet and the LAN end to the LAN. The Wan end of the router must be set differently because the access method provided by the ISP is different.