VPN access to the industrial router's intranet IP allows remote users to securely connect to devices and networks in the industrial environment, which is commonly used to remotely monitor and manage industrial control systems such as production line automation, remote diagnostics, firmware updates, configuration changes, and access to device logs.
Application scenarios include, but are not limited to, industrial manufacturing, power monitoring, oil and gas facilities, transportation infrastructure, etc. By accessing these systems through a VPN, engineers and technical support teams can respond to issues in a timely manner, optimize operational efficiency, and ensure high availability and security of critical infrastructure.
In this article, we will briefly introduce the reasons and solutions for not being able to access the private IP of an industrial router through a VPN.
This includes mismatches between client and server configurations, incorrect routing (for example, no routing rules that direct traffic to private IPs), and unauthorized access to private resources.
The workaround includes checking the configuration of the VPN client and server, and ensuring that the VPN client has access to the private IP address.
The network connection of the VPN server or client is unstable or interrupted, and there may be IP conflicts between the intranet and the VPN address pool. The solution is to check the reliability of the network connection, check the IP address, and adjust the conflicting IP address.
A firewall may block VPN traffic. The firewall rules of industrial routers and VPN servers need to be checked and adjusted in advance.
Industrial routers may have ACLS (Access Control Lists) or other security policies that block access. Check whether ACLS or other security policies restrict access.
The remotely configured feature or service is not enabled. Or the industrial router may be set up with security measures such as MAC address filtering.
You can reconfigure the VPN service of the industrial router, as well as attempt to reboot the VPN server and the industrial router.
The VPN client device or industrial router hardware failure.