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never tried myself, but I would say:
- make an alias for the website (url/ip) for the allowed websites
make a firewall allow rule for this alias port 80 and 443
make another firewall rule below the above with block all port 80 and 443

Anyone know if this way works? And can you give more details? Such as would I make these rules under my LAN or WAN? Also I only have 1 LAN and no VLANs ,yet,. I do not want to block myself out of the opnsense web UI... Do I need to add another rule for that?

I want to block all internet access except 6 specific websites. What is the best way to do this with Opnsense? I've read the documentation on "Setup Web Filtering" and "zenarmor" but these seem to be a little overkill for my simple whitelist. It would be nice to apply this to specific VLANs but that would not be strictly required.