Basic routing knowledge: detailed introduction to vro protocols

With the development of the routing technology, we have also promoted the continuous improvement of the router protocol. Here we mainly explain the comprehensive introduction of the Router Protocol. To explain the concept of the router, we must first introduce what is routing. The so-called "routing" refers to the behavior and action that transmits data from one place to another. The Router is the machine that executes such behavior. Its English name is Router.

In order to complete the "Routing" work, the router stores the data related to various transmission paths-the route Table Routing Table) for Routing selection. The route table contains the subnet flag information, the number of online routers, and the name of the next router. The route table can be set by the system administrator or dynamically modified by the system. It can be automatically adjusted by the Router Protocol or controlled by the host. Two concepts about IP addresses are involved in a router: static route table and dynamic route table. The system administrator sets a fixed route table in advance, which is called a static route table. Generally, it is set in advance according to the network configuration during system installation, it will not change as the network structure changes in the future. Dynamic) the route table is the route table automatically adjusted by the Router Protocol according to the running status of the network system. The router selects the Routing Protocol) to automatically learn and remember the network running status, and automatically calculate the optimal path for data transmission as needed.

Add basic protocols for vrouters

A Router is a network device used to connect multiple networks or CIDR blocks. These networks can be networks that use different protocols and architectures (such as the Internet and LAN), or networks of different network segments (such as networks of different departments in a large Internet ), when data is transmitted from one department network to another department network, you can use a router. Nowadays, more and more local networks are using vro protocol broadband sharing. When the Router Protocol is connected to different networks or CIDR blocks, it can "translate" the data information between these networks, and then "translate" the data that can be "read" by both parties, in this way, interconnection between different networks or CIDR blocks can be achieved. It also provides the ability to determine network addresses and select paths, as well as filter and separate network information flows. At present, routers have become hubs connecting backbone networks, backbone networks, and the backbone networks and the Internet.

NAT: Network Address Translation (Network Address Translation). The router can use the NAT Function to convert the IP addresses inside the LAN to valid IP addresses for Internet access. For example, a computer with an IP address 192.168.0.1 can communicate with other computers in the LAN, then, you need to use the NAT Function to convert 192.168.0.1 to a valid Wan IP address, such as 210.113.25.100.

DHCP: The full name is Dynamic Host Configuration Protocol (Dynamic Host Configuration Protocol). Through the DHCP function, the router can dynamically specify IP addresses for hosts in the network, without the need for each user to set static IP addresses, and distribute TCP/IP configuration parameters to valid network clients in the LAN.

DDNS: The full Name of Dynamic Domain Name Server (Dynamic Domain Name resolution system), usually known as "Dynamic DNS", because for ordinary broadband Internet access, use Dynamic IP addresses provided by the ISP (network service provider. If an Internet user needs to access a server created in the LAN, the dynamic IP address can be resolved to a fixed domain name through the DDNS function of the router protocol.

PPPoE: PPP over Ethernet (Point-to-Point Protocol over Ethernet). Through PPPoE technology, users of broadband Modem (such as ADSL Modem) can obtain personal authentication access from the broadband network, you can create a virtual dial-up connection for each user to connect to the Internet at high speed. The vro can enable automatic dial-up connection of PPPoE so that users connected to the vro can automatically connect to the Internet.

ICMP: Internet Control Message Protocol (Internet Control Message Protocol). This Protocol is a sub-Protocol in the TCP/IP Protocol set. It is mainly used to transmit Control information between the host and the router Protocol, including reporting errors, switch restriction control, and status information. A vro protocol is one of the essential network devices in an interconnected network. A vro is a network device that connects multiple networks or CIDR blocks, it can translate data information between different networks or CIDR blocks so that they can "read" each other's data to form a larger network. Vro has two typical functions: Data tunnel and control. The data channel functions include forwarding decision, backplane forwarding, and output link scheduling, which are generally completed by specific hardware. The control functions are generally implemented by software, it includes information exchange with neighboring routers, system configuration, and system management.