With the NetworkExtension framework, you can customize and extend the core networking features of iOS and macOS. Specifically, you can:
Change the system’s Wi-Fi configuration
Integrate your app with the hotspot network subsystem (Hotspot Helper)
Create and manage VPN configurations, using the built-in VPN protocols (Personal VPN) or a custom VPN protocol
Implement an on-device content filter
Implement an on-device DNS proxy
The NetworkExtension framework is available in macOS and iOS, but not all features are available on both platforms and some features have specific restrictions (for example, some features only work on supervised iOS devices). The documentation for each feature describes these restrictions.
A crash (or system crash) in computing is an event in which a computer or a program (such as a software application or an operating system) ceases to function properly, often exiting after encountering errors. The program responsible may appear to freeze or hang until a crash reporting service documents details of the crash. If the program is a critical part of the operating system kernel, the entire computer may crash, often resulting in a fatal system error. […]