Gateway is an indispensable part of modern communication technology. It acts as a bridge between different networks, such as Internet and local area network, making communication between different networks more convenient and efficient. It can convert the protocol format of one network into a format that can be recognized by another network, and realize data transmission between different networks. Gateway also has the functions of routing, security detection, data filtering and so on.
The main function of gateway is to realize data transmission between different networks. It needs to have the ability to convert different protocol formats, support data caching, grouping, assembly, retransmission and other functions to ensure fast and stable data transmission. In addition, the gateway can also realize network security functions such as routing, firewall and intrusion detection. , to ensure network security.
In a word, the gateway plays an important role in the computer network. It connects different networks and provides data forwarding, routing, protocol conversion, address conversion, security protection and other functions to ensure smooth and safe network communication.
Classification of gateways
1, border gateway: A border gateway is a gateway connecting different autonomous systems (AS) and is used for routing and data forwarding in the Internet. It is mainly responsible for handling data traffic across multiple network boundaries.
2. Default Gateway: The default gateway is the gateway used to connect the local network and the external network (usually the Internet). When the computer needs to send a packet to a destination address that is not in the local network, the packet will be sent to the default gateway, and the default gateway will forward the packet.
3. Local gateway: The local gateway is used to connect the internal networks of the local network and handle the communication between the internal networks. It is usually used to realize data forwarding and routing in LAN.
4. Protocol Gateway: A protocol gateway is a gateway used to convert data between different protocols. Protocol interworking between different networks can be realized, such as converting IPv4 packets into IPv6 packets.