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Thank's for your reply, I see opnsense isn't the right tool for me at this point. I'll stick to FreeBSD for further homelab experiments, and maybe one day, I'll be ready to add an opnsense behind a real modem :-).

Thanks for the article.

It points to some important points to consider. But, if I do get this right, it almost makes no sense to run opnsense behind the FritzBox that acts as a router. Is that really what you wanted to point out?

What about the follwing scenarios:

- an IPv6 only local network (this means no dublicate NAT, because NAT is not required with IPv6?)
- using the OpnSense as an VPN entry point (including firewalling and routing within that VPN and also for traffic that leaves and enters the VPN)

Doesn't this make sense at all? I mean, should I really stop figuring stuff out, because it will fail for sure? I know that this article was written with IPv4 in mind. But wouldn't VPN and IPv6 change some of the assumptions? Sorry for being newbie to this :-).