How to solve the problem of 4G card IP on 4g cellular router equipment not being fixed?

In the application of IIoT, 4g cellular routers serve as a bridge between remote devices and data centers, undertaking key data transmission and communication tasks. However, when 4g cellular routers use 4G cards for wireless communication, they often encounter the problem of unfixed IP addresses, which poses many challenges for remote management and maintenance. This article will provide an in-depth analysis of the causes and impacts of unfixed IP addresses on 4G cards, as well as specific solutions and steps, while exploring their feasibility and potential risks.

I. Reasons and impacts of 4G card IP not being fixed

Reason

1.Dynamic IP allocation mechanism: 4G networks generally adopt a dynamic IP allocation mechanism, which means that each time a device connects to the network, a new IP address is assigned by the operator's DHCP server. This mechanism results in different IP addresses being obtained each time the device goes online.
2.Operator strategy: Different operators may have different IP management strategies, such as the size and allocation period of the IP address pool, which can also affect the stability of IP addresses.
3.Changes in the network environment: External environmental factors such as network congestion, base station failures, and signal fluctuations may also lead to frequent changes in IP addresses.

Influence

1.Remote access difficulties: The non-fixed IP address makes remote access and management complicated, requiring constant querying and updating of the device's IP address.
2.Unstable data transmission: Frequent changes in IP addresses may lead to interruptions or delays in data transmission, affecting the stability and reliability of the system.
3.Increased security risks: Unstable IP addresses increase the risk of devices being attacked because it is difficult for attackers to predict and locate target IPs.

II. Solutions and Procedures

1. Use DDNS dynamic domain name service

Technical means:
DDNS can map dynamically changing IP addresses to a fixed domain name, allowing access to devices through the domain name, thereby solving the problem of unfixed IP addresses.
Implementation steps:

①. Choose a DDNS service provider: Choose a stable and reliable DDNS service provider, such as Peanut Shell, No-IP, etc.

②. Configure the router: Enable the DDNS function in the router, and fill in the account information and domain name of the DDNS service provider.
③. Set up scheduled updates: Ensure that the router can regularly update the IP address to the DDNS server to keep the domain name and IP synchronized.

2. Apply for a static IP address

Technical means:
Apply for a static IP address directly from the operator, so that the device will always get the same IP address each time it goes online.
Implementation steps:
①. Contact the operator: Contact the operator of the 4G card to understand the application process and fees for static IP addresses.
②. Submit an application: Submit application materials according to the requirements of the operator, including equipment information, usage scenarios, etc.
③. Configure the router: After obtaining a static IP address, set up the router according to the configuration guide provided by the operator.

Use a VPN virtual private network

Technical means:
Through VPN technology, an encrypted tunnel is established between the device and the data center, allowing stable data transmission through the VPN tunnel regardless of changes in the device's IP address.
Implementation steps:
1.Choose a VPN service provider: Choose a VPN service provider that supports 4g cellular routers and purchase the corresponding service.
2.Configure VPN: Configure VPN clients and servers on the router and data center, respectively, and set the corresponding encryption protocols and authentication methods.
3.Testing and optimization: Conduct testing of VPN connections to ensure the stability and security of data transmission, and optimize as needed.

III. Feasibility and Advantages of the Solution

feasibility

The above solutions have been widely used in the field of industrial Internet of Things, with mature and stable technology. In particular, DDNS and static IP address applications have become common means to solve the problem of unstable IP addresses for 4G cards.

advantage

1.Improve remote access efficiency: Through DDNS or static IP addresses, it is easy to remotely access and manage devices, improving work efficiency.
2.Enhance data transmission stability: VPN technology can ensure the stability and security of data transmission, reducing data interruptions or delays caused by IP address changes.
3.Reduce security risks: Using VPN and DDNS services can effectively prevent devices from being maliciously attacked and illegally accessed.

IV. Possible risks and challenges

1.Cost issues: The application of static IP addresses and the purchase of VPN services may increase additional costs.
2.Configuration complexity: The configuration of DDNS, static IP, and VPN is relatively complex and requires certain professional knowledge and experience.
3.Reliance on external services: DDNS and VPN services rely on external service providers, and once the service is interrupted or fails, it may affect remote access and data transmission of the device.
The issue of inconsistent IP addresses for 4G cards on 4g cellular router devices can be addressed through the use of DDNS, applying for static IP addresses, or using VPN technology. When selecting and implementing solutions, it is necessary to consider factors such as cost, feasibility, security, and stability to ensure the stable operation and efficient management of industrial IoT systems.