"Quote from: Kamislav on November 02, 2024, 02:06:57 PM+1 for option to specify custom config lines
+1 for option to prowide custom config file
After more investigation I have found, that this functionality is beeing removed from OPNSense for security reasons (user with GUI access can abuse some config to run privileged commands and thus bypass security - based on real security issue from the past).
So what you can do is to implement needed options/configurations to be set using the GUI. It is not so hard, you need to modify few files under the /usr/local/opnsense/mvc/app/ path. Actualy there are still legacy blocks of code, so it is a bit messy. I think enyone with average knowledge about php and MVC frameworks can do this for you. Also consider of providing it as a patch for comunity.
