Yes, there are several technical ways to permanently disable a computer's internet access without damaging the hardware. However, it is important to note that "permanent" in this context usually means extremely difficult to recover through conventional means, rather than absolutely irreversible. Here are a few possible methods: 1. **BIOS/UEFI settings**: - **Disable network interfaces**: Entering the computer's BIOS or UEFI settings, you can choose to disable the built-in network adapters (such as Ethernet cards or wireless cards). This will make these network devices unrecognizable to the operating system. However, users with technical knowledge may be able to re-enable network interfaces by resetting the BIOS or modifying the settings. 2. **Firmware-level modifications**: - **Remove or replace network adapter firmware**: By modifying the firmware of a network adapter, it is possible to make it unable to work properly. This method is more destructive than simply disabling it, but it is still reversible, especially if there is access to the original firmware. 3. **OS configuration**: - **Disable network drivers**: Disabling or uninstalling network drivers in the operating system prevents the system from accessing the internet through these drivers. However, this method is relatively easy to recover by a privileged user. - **Firewall rules**: Configure firewall rules to block all traffic to and from the network. This effectively blocks Internet access, but can also be restored by adjusting firewall settings. 4. **Physical isolation (no damage to hardware)**: - **Disable network interface**: Disable the network interface at the hardware level (such as through a motherboard jumper or switch) without damaging the actual hardware components. This requires a certain amount of hardware knowledge and may involve opening the computer case. 5. **Use dedicated software or policies**: - **Application restriction software**: Install dedicated software to restrict or monitor network access to ensure that only authorized network activities can be carried out. This type of software is often used in corporate environments and has high security and irreversibility, but it still requires regular maintenance. 6. **Network administrator control**: - **Router or switch configuration**: Configure rules on network devices (such as routers or switches) to block Internet access for specific devices. This method does not require changing the settings of the target computer, but requires control over the network device. ### Notes - **Reversibility**: Most methods are technically reversible, especially if the target user has sufficient technical knowledge. Therefore, "permanence" is not technically absolute, but more of an increase in the difficulty of recovery. - **Legal and Ethical**: Disabling Internet access on another person's device without authorization may involve legal and ethical issues. Please ensure that you have legal authority and reasonable reasons to perform such operations. - **Backup and Recovery**: Before making any major changes, it is recommended to back up important data to prevent accidental data loss or system failure. In summary, although there are multiple ways to effectively disable Internet access on a computer, it is challenging to achieve true permanence and irreversibility, and it needs to be operated within a legal and ethical framework.