In the Industrial Internet of Things (IIoT), 4G cellular modem is the key component to realize remote data transmission.Especially when using the 4G network for communication.Whether port mapping is required for 4G cellular modem depends on the specific application scenario and requirements.We will explore the relationship between 4G cellular modems and port mapping in more detail below.
Port Mapping or Port Forwarding is a network configuration technique,Used to forward a specific port request from an external network (usually public) to a specific device in an internal network (usually local area networkOr on the server. The main purpose of this is to allow the external network to access the resources of the internal network,Even if these resources are behind a firewall or NAT (Network Address Translation) device.
Relationship between 4G cellular modem and port mapping
For 4G cellular modems, the need for port mapping depends on the following:
1. Access requirements: if you need to access internal devices or services connected to the 4G cellular modem through an external network (such as the Internet),Port mapping is required. For example, scenarios such as remote monitoring, data upload/download, etc., may require external access.
2. Network architecture: In some network architectures, the 4G cellular modem may be behind a NAT device such as a router or firewall.In this case, in order to allow external network access to the 4G cellular modem and its connected devices or services,Port mapping is required.
3. Security Considerations: Opening port mappings can increase security risks,Because the external network can access the internal network through the mapped port.Therefore, security must be carefully evaluated when deciding to port map,And take appropriate security measures (such as using firewalls, VPNs, etc.).
3. How to perform port mapping
If you determine that port mapping is required, you can configure it by following these steps:
1. Determine the mapped port and service: First, determine the IP address and port of the external port and internal service to be mapped.For example, if you need to map a port 80 request from the external network to port 8080 of the 192.168.1.100 device on the internal network,Then the external port is 80, the internal IP address is 192.168.1.100, and the internal port is 8080.
2. Log in to the router or firewall device: Log in to the management interface of the router or firewall device through the browser.
3. Configure a port mapping rule: Locate the Port Mapping or Port Forwarding option in the Administration interface and add a new mapping rule.The rule should include information such as external port, internal IP address, and internal port.
4. Save and Apply Configuration: When you finish configuring the mapping rule, save and apply the changes.At this point, the router or firewall device will begin port mapping according to the configured rules.
IV. Summary
Whether port mapping is required for 4G cellular modem depends on the specific application scenario and requirements.If you need to access internal devices or services connected to the 4G cellular modem over an external network, port mapping is required.However, when you do port mapping, you must carefully evaluate security and take appropriate security measures.Through reasonable configuration and management, the 4G cellular modem can be ensured to meet the access requirements,Maintain network security and stability.
