GoKawiilNebula 1.10 is here with IPv6 support in the overlay network, multiple Nebula IPs per host, a new certificate format, and more. This release represents over a year of development effort across numerous pull requests; You can see the full scope in the Nebula v1.10 milestone and the changelog. IPv6 overlay support was one of our oldest and most requested features and it has finally landed in December 2025!
You can grab this update for Nebula OSS in all the usual places, including:
See the v1.10.0 changelog for the full list of features in this release.
Year of the IPv6 overlay network
IPv6 adoption, like Linux on the desktop, has been a decades long journey. Almost all devices made in the last decade or two support IPv6, but network admins following outdated security recommendations often disable it, and aging network equipment may not yet support IPv6. With IPv4 address exhaustion becoming increasingly problematic and IPv6 providing virtually unlimited address space, full IPv6 support is table stakes for any modern networking solution.
Why IPv6 in overlay networks matters
Supporting IPv6 in Nebula unlocks key capabilities that make network transitions smoother and more flexible. The vast IPv6 address space eliminates addressing conflicts which often occur when connecting multiple IPv4 subnets with overlapping ranges, allowing Nebula to connect multiples jobsites seamlessly. And by adopting IPv6 in your overlay network today, you’re preparing for the inevitable IPv6-dominant future without waiting for your physical networking infrastructure to support it.
The upgrade path
Upgrading Nebula to use IPv6 is as straightforward as 1, 2, 3… The process involves upgrading everyone to Nebula v1.10, creating a v2 CA, trusting it on every host, and minting all hosts v2 certs with IPv6 and IPv4 overlay addresses, after which you’ll have a mixed IPv4/IPv6 overlay network up and running.
The beauty of this approach is that you can run both certificate formats simultaneously during the transition, ensuring zero downtime for your network. For detailed steps, check out our comprehensive guide on how to upgrade your OSS Nebula network.
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