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Any good book you would recommend me to read in order to get deeper knowledge on OpnSense?

I can recommend you "Practical OPNsense" by Markus Stubbing. It's a great one for the beginning. You also may find some helpful literature on the particular resources. For example, this book https://freebooksummary.com/category/a-separate-peace is my favorite, and I also always read the books here. Finding a good resource, especially tech-related books, is a big challenge.

you must add your IP to http. There is something like "naxsi source IP"