The proxy server crashed today. After all, it has not been shut down for a long time. I used win2003 connection sharing to allow the PC of the internal LAN to connect to the Internet. More than 40 computers in the unit are connected through the 2003 share. It is basically normal to use it. Some FTP servers cannot be connected. There are no access restrictions in 2003. I have been puzzled. Today, the proxy server happened to strike, so I let him rest. I replaced a quidway2621 router. I simply configured the port and router rule nat and connected. I felt that the Internet was much faster than the proxy server, and the router forwarding speed was better. Moreover, the FTP server that cannot be connected normally is now good and can connect normally!
By the way, I checked the specific definitions and differences between ics and nat:
What is ICS
ICS is the English abbreviation of Internet Connection Sharing. It is an Internet connection sharing service provided by the Windows system for home networks or small intranet networks. It is actually equivalent to a network address converter. The so-called network address converter is that when the data packet is forwarded, it can convert address information such as IP address and TCP/UCP port in the data packet. With a network address converter, computers in a home network or a small office network can use private addresses, and the private addresses are converted into a single public IP address assigned by the ISP through the network address converter to enable the Internet connection. ICS method is also called Internet conversion connection.
What is NAT
NAT is network address translation (Network Address Translator). In a broad sense, ICS also uses a NAT technology. However, the NAT we are discussing here refers to using a computer running Windows 2000 Server as an IP router, through which it forwards data packets between the local area network and the Internet host to realize Internet sharing. The NAT method is also called Internet routing connection. Network address translationNATBy converting dedicated internal addresses to public external addresses, internally managed IP addresses are hidden from the outside. In this way, the cost of IP address registration is reduced by using non-registered IP addresses internally and converting them into a small portion of externally registered IP addresses. At the same time, this also hides the internal network structure, thereby reducing the risk of internal network attacks.
The difference between ICS and NAT
Speaking of this, it seems to be confused. So what is the difference between the two? In the Windows 2000 help file, ICS and NAT are called Internet conversion connections and routing connections respectively. In fact, to put it bluntly, ICS is a simplified version of NAT. Using ICS does not require understanding some knowledge of IP addresses and routing, and also provides a simplified configuration for sharing the Internet using Windows 2000 routers in a LAN. However, ICS may not allow all IP communications between the LAN and the Internet host, such as multi-player games, real-time communications and other peer services such as Diablo. If you use a dedicated address on the public Internet or use the same port number at the same time, these applications will be aborted. NAT configuration requires knowledge about IP address and routing configuration. Its configuration is more complex than ICS, which allows all IP communication between the local area network and the Internet host. In addition, ICS can only use one legal public IP address, while NAT can use multiple legal public IP addresses provided by the ISP for the client to share by configuring the address pool.
By the way, I checked the specific definitions and differences between ics and nat:
What is ICS
ICS is the English abbreviation of Internet Connection Sharing. It is an Internet connection sharing service provided by the Windows system for home networks or small intranet networks. It is actually equivalent to a network address converter. The so-called network address converter is that when the data packet is forwarded, it can convert address information such as IP address and TCP/UCP port in the data packet. With a network address converter, computers in a home network or a small office network can use private addresses, and the private addresses are converted into a single public IP address assigned by the ISP through the network address converter to enable the Internet connection. ICS method is also called Internet conversion connection.
What is NAT
NAT is network address translation (Network Address Translator). In a broad sense, ICS also uses a NAT technology. However, the NAT we are discussing here refers to using a computer running Windows 2000 Server as an IP router, through which it forwards data packets between the local area network and the Internet host to realize Internet sharing. The NAT method is also called Internet routing connection. Network address translationNATBy converting dedicated internal addresses to public external addresses, internally managed IP addresses are hidden from the outside. In this way, the cost of IP address registration is reduced by using non-registered IP addresses internally and converting them into a small portion of externally registered IP addresses. At the same time, this also hides the internal network structure, thereby reducing the risk of internal network attacks.
The difference between ICS and NAT
Speaking of this, it seems to be confused. So what is the difference between the two? In the Windows 2000 help file, ICS and NAT are called Internet conversion connections and routing connections respectively. In fact, to put it bluntly, ICS is a simplified version of NAT. Using ICS does not require understanding some knowledge of IP addresses and routing, and also provides a simplified configuration for sharing the Internet using Windows 2000 routers in a LAN. However, ICS may not allow all IP communications between the LAN and the Internet host, such as multi-player games, real-time communications and other peer services such as Diablo. If you use a dedicated address on the public Internet or use the same port number at the same time, these applications will be aborted. NAT configuration requires knowledge about IP address and routing configuration. Its configuration is more complex than ICS, which allows all IP communication between the local area network and the Internet host. In addition, ICS can only use one legal public IP address, while NAT can use multiple legal public IP addresses provided by the ISP for the client to share by configuring the address pool.