What is a router

The English name of the router is router, a network device that is used to connect multiple network or network segments.

These networks can be several networks that use different protocols and architectures (such as the Internet and the local area network), and can be networks of several different segments (such as networks of different sectors of the large Internet) that can be used by routers when data information is transferred from one department network to another. Now, the home LAN also more and more use the router broadband sharing way to surf the internet.
　　
When routers connect different network or network segments, they can "translate" the data information between these networks, and then "translate" into both sides can "read" the data, so that the interconnection between different networks or segments can be realized (see photo). At the same time, it also has the function of judging network address and choosing path, and filtering and separating network information flow. At present, routers have become a hub for the connections between the backbone networks, the backbone network, and the backbones and the Internet.
　　
NAT: Full Name network address translation (network addresses translation), routers through the NAT function can convert the IP address within the LAN to legitimate IP address and Internet access. For example, the local area network has an IP address for 192.168.0.1 computer, of course, through the IP address can communicate with other computers in the intranet; but if the computer wants to access an external Internet network, Then you need to convert 192.168.0.1 to a valid WAN IP address via NAT, such as 210.113.25.100.
　　
DHCP: Full name Dynamic host Configuration Protocol (DHCP), which enables routers to dynamically assign IP addresses to hosts within a network without requiring each user to set a static IP address, and to tcp/ IP configuration parameters are distributed to legitimate network clients within the LAN.
　　
DDNS: Full name Dynamic Domain name Server (dynamical DNS system), often referred to as "Dynamic DNS", because for ordinary broadband Internet access is the ISP (Network service provider) provided by the dynamic IP address. If you set up a server in your LAN that requires Internet users to access it, you can resolve the dynamic IP address to a fixed domain name through the DDNS function of the router. such as www.cpcw.com, so that internet users can use the fixed domain name on the intranet server access.
　　
PPPoE: Full name PPP over Ethernet (Point-to-Point Protocol on Ethernet), through the PPPoE technology, you can make broadband modems (such as ADSL modem) users access to the broadband network of personal authentication access, can create a virtual dial-up connection for each user, This allows you to connect to the Internet at high speed. The router has this feature, which enables the automatic dial-up connection to PPPoE, so that users connected to the router can automatically connect to the Internet.
　　
ICMP: Full name Internet Control message Protocol (Internet controlled messaging protocol), a child protocol in the TCP/IP protocol set, used primarily to pass control information between hosts and routers, including reporting errors, Exchange restricted control and status information.