this post was submitted on 16 Aug 2025
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37
IPv6 & Opnsense & Not Exposing Machine-Specific IPv6s to Corpos (piefed.blahaj.zone)
submitted 1 month ago* (last edited 1 month ago) by glizzyguzzler@piefed.blahaj.zone to c/selfhosted@lemmy.world
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I have had IPv6 off for a long time now, but it feels like now is time to actually try. I'm planning on setting the WAN side to DHCPv6 and the LAN side to Static IPv6 to match the IPv4 settings. https://docs.opnsense.org/manual/ipv6.html (I see people say "talk to your ISP about dynamic or static and what block size" but I would rather collapse into a singularity than contact my ISP unforced, so I shan't do that)

I've tried to read about IPv6 but I just don't have enough knowledge-ground to stand on to make sense of it in an actionable way.

From what I have read and (mildly) understood, I think I know that IPv6 addresses are directly identifying; no longer does everything on the internet see the IPv4 of your router only - now things see your specific device's IPv6 that's a... subset? of the router's IPv6 range (not single IP) assigned. https://superuser.com/a/1735921 People describe it as a different way to network, which I guess means no matter what I read I'm still not sure what to do.

I want IPv6 to work exactly like IPv4: router has WAN IPv4 address and masquerades for every device in the network. I don't want Google knowing exactly which computer contacted them from inside my LAN, I want them to put in the work to finger print my device with various ways that are likely illegal in the EU.

How do I prevent that IPv6 privacy issue, or did I misunderstand how IPv6 works?

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[–] varyingExpertise@feddit.org 4 points 1 month ago* (last edited 1 month ago)

Well, it IS a not very reasonable take that seems to be grounded in a certain unwillingness to deal with new and unknown yet things. How do I solve address overlap in RFC1918 and various VPNs reliably without IPv6? This starts to become a problem when I think about my self hosted music server accessed through a wireguard tunnel and I'm at a friend's house. Not too outlandish problem for the crowd around here, I'd guess.