What is the gateway The role of the gateway

What is a gateway? What is a gateway? What is a gateway?

1. What is a gateway

The English name of the gateway: gateway, also known as network connector and protocol converter. A gateway is a facility used to provide network compatibility functions such as protocol conversion, routing selection, and data exchange when intercommunication between networks using different architectures or protocols.

2. The role of the gateway

The gateway is the most complex network interconnection device to realize network interconnection on the transport layer, and is only used for the interconnection of two networks with different high-level protocols. The gateway can be used for both wide area network interconnection and local area network interconnection.

A gateway is a computer system or device that serves as an important task of conversion. Between two systems that use different communication protocols, data formats or languages, or even completely different architectures, the gateway is a translator. Unlike the bridge that simply conveys information, the gateway repackages the received information to meet the needs of the destination system.

At the same time, the gateway can also provide filtering and security functions. Most gateways run on the top layer of the OSI 7-layer protocol-the application layer.

3. Gateway type

a. Transport gateway

The transport gateway is used to establish a transport connection between two networks. Using the transmission gateway, hosts on different networks can establish cascaded, point-to-point transmission connections across multiple networks. For example, a commonly used router is a transmission gateway. The role of a "gateway" is to connect two different network segments, or a connection between two different routing protocols, such as RIP, EIGRP, OSPF, BGP, etc.

b. Application Gateway

The application gateway performs protocol conversion on the application layer. For example, one host implements the ISO e-mail standard, and the other host implements the Internet e-mail standard. If the two hosts need to exchange e-mails, they must go through an e-mail gateway for protocol conversion. This e-mail gateway is a Application gateway. NCP is a protocol that works on the seventh layer of OSI, used to control the interaction between the client station and the server, and mainly completes the functions of opening, closing, and reading files in different ways.

c. Signaling Gateway

The signaling gateway SG mainly completes the relay of signaling messages between the No. 7 signaling network and the IP network. In the early stage of 3G, it completes the message transfer between the access side and the core network exchange (RANAP between 3G). Message, BSSAP message between 3G and 2G), in addition, it can also complete the transfer of ISUP message between 2G MSC/GMSC and soft switch.

d. Relay gateway

The relay gateway is also called an IP gateway, and it is a VoIP device that meets the needs of telecom operators and enterprises. The relay gateway (IP gateway) is constructed based on a relay board and a media gateway board. A single board can provide up to 128 channels of media conversion, two Ethernet ports, and the chassis adopts the industry-leading CPCI standard, which is convenient for expansion and has high stability Features such as high reliability, high density, and large capacity.

e. Access gateway

The access gateway is a media access gateway for IP-based voice/fax services, providing efficient and high-quality voice services, and providing VoIP solutions for operators, enterprises, communities, and residential users.

f. Protocol Gateway

Protocol gateways usually do protocol conversion between network areas that use different protocols. This conversion process can occur between the second, third, or second and third layers of the OSI reference model. However, there are two protocol gateways that do not provide conversion functions: security gateways and pipes. Due to the logical difference between the two interconnected network areas, the security gateway is a necessary intermediary between the two technically similar network areas. Such as private WAN and public Internet.

g. Security Gateway

The security gateway is an interesting fusion of various technologies and has an important and unique protective effect, ranging from protocol-level filtering to very complex application-level filtering.

It can be said that a gateway is a computer system or device that serves as an important task for conversion. Between two systems that use different communication protocols, data formats or languages, or even completely different architectures, the gateway is a translator.

Unlike the bridge that simply conveys information, the gateway repackages the received information to meet the needs of the destination system. At the same time, the gateway can also provide filtering and security functions. Most gateways run on the top layer of the OSI 7-layer protocol-the application layer.