# ifupdown-ng ifupdown-ng is a network device manager that is largely compatible with Debian ifupdown, BusyBox ifupdown and Cumulus Networks' ifupdown2. ## Dependency Resolution ![Dependency resolution example](doc/img/dependency-resolution.png) ifupdown-ng uses a dependency resolver to determine interface bring-up order in a deterministic way. To use this feature, you must declare relationships between interfaces with the `requires` keyword. This keeps the implementation efficient. For convenience, the `requires` keyword is exported to executors as the `IF_REQUIRES` environment variable. For compatibility with some legacy ifupdown executors, we also provide the `requires` keyword under other environment variables in some cases. ## Caveats * ifupdown2 python plugins are not supported at this time. An executor could be written to handle them. * ifupdown-ng retains compatibility with /etc/network/if-X.d scripts, but will prefer using executors in /usr/libexec/ifupdown-ng where appropriate. This package is planned to replace BusyBox ifupdown in Alpine at some point in the future.