What does the WAN port and LAN port on the router mean? __ Computer network

Now the general family Internet use ADSL telephone line more online, and the home generally have several computers, so how to make a few computers at the same time Internet. This is to use the broadband router, in general, there are several cable sockets on the broadband router, these network cable sockets on some labeled WAN, and some network port labeled LAN, in the end what is the meaning of it. And what difference does it have. Please look down.
First, the difference between the WAN port and LAN port on the broadband router

The WAN is written in the first letter of the English Wide Area network, which represents the WAN, while the LAN is written by the local area network, that is, the native network (or LAN). From their names it is not difficult to see that the WAN port is mainly used to connect the external network, such as ADSL, DDN, Ethernet and other access lines, and LAN port to connect the home network, mainly with the home network of switches, hubs or PCs connected. It can be said that the two types of network mouth, a class of internal.

Second, network cable connection of WAN port and LAN port in broadband router first, the Internet operator provides access to the WAN port, and then several computers sharing the Internet to the LAN port, and then use a computer login router management interface for the corresponding configuration to complete the sharing of the Internet.

The transmission process of network data at WAN and LAN ports       when a machine in a home network sends packets to an external network, it first sends a request to the default gateway, which is sent to the broadband router. When the router analyzes the intranet IP address in the packet, it checks the NAT address translation table of the device itself. After the corresponding entry is found, the WAN IP address is used to communicate with the external network.       when an external network receives a packet, it resolves the WAN IP address of the router in the packet, responds to the address, and sends the response packet to the router. Then the router makes the NAT address translation again, converts the WAN IP address to the intranet IP address of the request, and completes the process of sending and receiving the whole packet.   with the increasing number of computers in the family that need to surf the internet, many families chose to use the broadband router to achieve shared access, however, due to the lack of knowledge of the network, many users in the purchase of broadband router, found that some of the network port labeled WAN, and some network port labeled LAN, the two network ports are used for what they are. What is the difference between them. How to use them better. Let a lot of friends make a worry, this article will be with you to understand the broadband router on the two types of network port differences and some new ways. I. Understanding the difference between WAN Port and LAN port friends who are familiar with the network know that the WAN is written in English wide area network, which represents the WAN, and that the LAN is written by local area network, that is, the native network (or LAN). Then we might take a Chinese name for the WAN and LAN ports on the router, which are the WAN port and the local network port respectively.   from their names it is not difficult to see that the WAN port is mainly used to connect the external network, such as ADSL, DDN, Ethernet and other access lines, and LAN port to connect the home network, mainly with the home network of switches, hubs or PCs connected. It can be said that the two types of network mouth, a class of internal. Multi-Wan port broadband router Secure network access in addition to the increase in bandwidth, most of the multiple WAN port routers also support full automatic load balancing and real-time backup, and according to the source or destination address to specify priority channel, the failure of automatic traffic redistribution and other functions.   Using multiple WAN ports broadband routers can basically avoid network outages caused by network operators. Although the purchase of multiple WAN port routers and increased network access lines will result in increased investment, but for shareholders friends, the guarantee is far greater than the pay of    III, the broadband router when the switch is used in addition to the regular WAN port to connect the outside of the household line, LAN port to connect the normal usage of the intranet computer, we can also put the household line andConnect the computer network cable is connected to the LAN port, the broadband router when the switch with the broadband router when the switch with   this connection way there are several noteworthy matters, first of all, you need your broadband router LAN port or Allied device network port to support the flip (Auto mdi/mdix) function, Otherwise, you may need to change your direct connection to a crossover line to enable your broadband router to connect to the external network via a LAN port. Second, using this method loses the routing function of the broadband router, so if you want to share the Internet, you need the computer in your home network to use the legitimate IP address of your carrier network. At the same time, in order to maintain access to the router, the IP address of the LAN port of the router is also set to the legal operator's address.