In today's era where the Industrial Internet of Things and remote communication are becoming increasingly important, establishing a local area network using 4G LTE routers in different locations has become a crucial method for achieving device interconnection, data sharing, and remote management. This technology enables 4G LTE routers located in different geographical locations to form a unified logical network, as if they were located in the same physical location, by constructing a virtual private network VPN or using other advanced network technologies. The following is a professional explanation of how to set up a local area network with a remote 4G LTE router:

I. Technical Principle

1.1 VPN technology: 

VPN is the abbreviation of virtual private network, which realizes secure connection between remote users or networks by establishing encrypted channels on public networks. Common VPN protocols include PPTP, L2TP/IPSec, OpenVPN, and others. Using VPN technology, two or more remote 4G LTE routers can be connected into a virtual local area network to achieve seamless communication between devices.

1.2 SD-WAN technology: 

SD-WAN is a software-defined wide area network, which is a new service that applies SDN software-defined network technology to the wide area network scenario. It can improve the flexibility and reliability of the network through intelligent routing, traffic optimization, and centralized management. In the construction of a local area network using 4G LTE routers in different locations, SD-WAN technology can simplify network architecture, reduce operation and maintenance costs, and provide higher network performance and security.

1.3 EOIP Tunnel: 

Ethernet over IPEoIP is a technology that transmits Ethernet frames over IP networks. Through the EoIP tunnel, a virtual Ethernet connection can be established between two remote 4G LTE routers to achieve direct interconnection of layer 2 networks. This technology is especially suitable for scenarios such as the Industrial Internet that require low latency and high reliability.

II. Application Scenarios

2.1 Cross-regional factory interconnection: 

For enterprises with multiple dispersed factories, the establishment of a local area network using 4G LTE routers in different locations can achieve interconnection between factory equipment, improving production efficiency and management level.

2.2 Remote monitoring and maintenance: 

In devices or systems that require remote monitoring, a local area network can be established through a remote 4G LTE router to transmit monitoring data in real time, facilitating remote viewing and maintenance of device status by operation and maintenance personnel.

2.3 Unattended equipment networking: 

For unattended express cabinets, intelligent parking lots and other equipment, a local area network can be established using a remote 4G LTE router to enable remote management and data upload.

2.4 Temporary network office scenario: 

In temporary network office scenarios such as exhibitions and construction sites, a secure network environment can be quickly established using a remote 4G LTE router to form a local area network, meeting office and communication needs.

III. Implementation Steps

3.1 Network planning and design: 

Define networking requirements, determine network topology, allocate IP addresses and subnets, etc.

3.2 Equipment selection and procurement: 

Select industrial 4G LTE routers that support technologies such as VPN, SD-WAN, or EoIP, and purchase the corresponding network equipment.

3.3 Equipment deployment and configuration: 

Install and configure 4g LTE router in different places, set VPN server and client parameters, and ensure network connectivity.

3.4 Security policy configuration: 

Configure security policies such as firewalls and intrusion detection to ensure the security and stability of the network.

3.5 Testing and Optimization: 

Conduct network connectivity testing, performance testing, and security testing, and optimize and adjust the network based on the test results.

3.6 Operation, maintenance and management: 

Establish a network operation and maintenance system, and regularly conduct network inspections, troubleshooting, and version upgrades.

IV. Precautions

4.1 Network security: 

During the process of establishing a local area network with a remote 4G LTE router, it is important to pay close attention to network security issues to ensure the confidentiality, integrity, and availability of data transmission.

4.2 Equipment compatibility: 

When selecting network equipment, pay attention to the compatibility and scalability of the equipment, so that it can be upgraded and expanded smoothly in the future.

4.3 Network performance: 

Select appropriate network technologies and equipment according to actual needs to ensure that network performance can meet business requirements.

Establishing a local area network with a remote 4G LTE router is a complex but important task, which is of great significance for achieving device interconnection, data sharing, and remote management. Through reasonable network planning, equipment selection, configuration and optimization, an efficient, secure and reliable remote LAN environment can be built.