The Computer Cannot Access The Internet through The Lan Port of The IoT Router
With the increasing popularity of IIoT, IoT routers play a crucial role as a bridge between remote devices and data centers. However, in practical applications, we may encounter a problem: computers connected to the LAN port of a IoT router via a network cable cannot access the Internet, but the same router's WIFI can access the network normally. This phenomenon seems complex, but there are several key reasons and solutions hidden behind it. This article will provide in-depth analysis of this phenomenon for friends in traditional industries.
I. Problem Background and Phenomenon Description
First of all, we should identify the core of the problem: when a computer is directly connected to the LAN port of a IoT router through a physical network cable, it cannot access the Internet, while the WIFI signal of the same router can seamlessly connect and access the network. This difference often confuses non-professionals.
II. Analysis of Possible Causes
2.1 IP address and subnet mask configuration issues
The primary reason why computers cannot access the Internet may be due to improper configuration of IP addresses and subnet masks. When assigning IP addresses, IoT routers usually automatically assign IP addresses and subnet masks to connected devices through DHCP services. However, if the computer is set to static IP and the IP does not match the network segment assigned by the router, or if the subnet mask is set incorrectly, it will result in an inability to access the Internet.
2.2 Routing table and NAT configuration
The router's routing table and NAT network address translation configuration are also key factors affecting Internet access. If the router's routing table is not set correctly, or the NAT function is not enabled or configured incorrectly, it may result in devices under the LAN port being unable to access external networks.
2.3 Firewall and Security Strategy
IoT routers usually have powerful firewall and security policy settings. If the firewall rules are set too strictly, or specific access restrictions are imposed on devices under the LAN port, it can also cause the computer to be unable to access the Internet.
2.4 Network cable and interface problems
Although it sounds simple, poor network cable connection or interface failure is also a common cause. Aging, damaged or loose network cables can affect data transmission and lead to an inability to access the Internet.
2.5 Computer-side setting problems
In addition, the network settings of the computer itself may also cause the inability to access the Internet. For example, the network adapter is disabled, the TCP/IP protocol stack is configured incorrectly, and so on.
III. Solution
3.1 Check and adjust the IP address and subnet mask
First, check the IP address and subnet mask settings of the computer. If it is set to static IP, try to change it to DHCP, or ensure that the static IP matches the network segment assigned by the router and the subnet mask settings are correct.
3.2 Check the routing table and NAT configuration
Log in to the router management interface and check the routing table and NAT configuration. Ensure that the routing table correctly points to the external gateway, that the NAT function is enabled, and that the configuration is correct.
3.3 Adjust firewall and security policy
Check and adjust the firewall and security policy settings of the router to ensure that there are no access restrictions for devices under the LAN port.
3.4 Replace the network cable and check the interface
Replace a new network cable and check whether the network cable interfaces of the router and computer are secure and undamaged.
3.5 Check the settings on the computer
On the computer, check whether the network adapter is disabled and whether the TCP/IP protocol stack is configured correctly. You can try restarting the network adapter or resetting the network settings.
The computer cannot access the internet through the LAN port of the IoT router, but it can through WIFI. There may be various reasons behind this phenomenon. From IP address and subnet mask configuration, routing table and NAT configuration, firewall, and security policy, network cable and interface issues to computer settings issues, each link may be the crux of the problem. By investigating these possible causes one by one and taking corresponding solutions, we can usually solve this problem and restore the normal internet access function of the computer. In the complex environment of industrial IoT, such troubleshooting ability is crucial to ensure the stable operation of the system.
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