Yes, there are a variety of technologies that can permanently disable Internet access to a certain computer without damaging the hardware equipment. Here are some common methods： ### 1. **BIOS/UFI settings** -**Disable the network adapter**: In the computer's BIOS or UEFAI settings, you can disable the network adapter (such as Ethernet and Wi-Fi adapters). This will prevent the computer from connecting to any network. -**Set the administrator password**: Set the administrator password in the BIOS/UFI to prevent others from re-enabling the network adapter. ### 2. **Operating system settings** -**Disable the network adapter**: In the operating system, the network adapter can be disabled through Device Manager (Windows) or network settings (macOS/Linux). This will prevent the computer from connecting to the Internet. -**Firewall rules**: Configure firewall rules to block all inbound and outbound network traffic. This can be achieved through Windows Firewall, macOS firewall, or Linux's iptv. -**Group Policy (Windows)**: In Windows, you can use the Group policy editor (gpedit. msc) to disable network access. For example, you can configure a policy to block all network connections. ### 3. **Router/network device configuration** -**MAC address filtering**: On routers or network devices, you can configure MAC address filtering to block network access from specific computers. -**IP address filtering**: Configure a router or firewall to block Internet access to a specific IP address. -**Parental control**: Many routers provide parental control functions that can restrict Internet access for specific devices. ### 4. **Software solutions** -**Third-party firewall software**: Install third-party firewall software and configure rules to block all network traffic. -**Network management software**: Use network management software (such as NetLimiter, GlassWire) to monitor and control network access. ### 5. **Physical isolation** -**Remove network equipment**: If the computer has a removable network adapter (such as a USB Wi-Fi adapter), you can remove it. -**Disconnect the network connection**: Although this requires manual operation, you can block Internet access by disconnecting the network cable or disable the Wi-Fi connection. ### 6. **Virtual machine/sandbox environment** -**Virtual machine isolation**: If the computer is running a virtual machine, you can configure the virtual machine not to be connected to the network, thereby restricting its Internet access. ### 7. **Registry editing (Windows)** -**Disable the network adapter**: You can disable the network adapter by editing the Windows registry. For example, you can modify a registry key to disable a specific network adapter. ### 8. **DNS configuration** -**Modify DNS settings**: Set the computer's DNS server to an invalid address, which will prevent the computer from resolving the domain name and thus cannot access the Internet. ### 9. **Disable DHCP** -**Manually configure network settings**: Disable DHCP and manually configure invalid network settings (such as wrong IP address, subnet mask, gateway, etc.), which will prevent the computer from connecting to the network. ### 10. **Software restriction policy (Windows)** -**Restrict network-related programs**: Use Software Restriction Policies or AppLocker to prevent network-related programs (such as browsers, mail clients, etc.) from running. These methods can permanently disable Internet access to a computer without damaging the hardware equipment. Which method to choose depends on the specific needs and environment.