this post was submitted on 16 Aug 2025
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IPv6 & Opnsense & Not Exposing Machine-Specific IPv6s to Corpos (piefed.blahaj.zone)
submitted 17 hours 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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[–] cmnybo@discuss.tchncs.de 11 points 16 hours ago (1 children)

The setting to look for is "IPv6 privacy extensions". That prevents your IP address from being tied to your MAC address. It should be enabled by default on any modern operating system. It can be set to either permanent or temporary.

IPv6 allows you to have multiple addresses on the same device. You can have a temporary address for all outbound connections and a fixed address for inbound connections.

[–] glizzyguzzler@piefed.blahaj.zone 2 points 14 hours ago

I had never picked up on this, thank you for name dropping what to look for!