Enable ipv6 on a Hetzner CoreOS server

Hetzner automatically assigns a ipv6 range to each server, but it does not assign a ipv6 address to it. This must be done manually for CoreOS by updating the network configuration in /etc/NetworkManager/system-connections/enp1s0.nmconnection to:

[connection]
id=enp1s0
type=ethernet
interface-name=enp1s0
uuid=f141878f-5566-303c-8231-1c1ab23f2256

[ipv4]
method=auto
dns=8.8.8.8,8.8.4.4

[ipv6]
method=manual
addresses=<your range here>::1/64,fe80::1
gateway=fe80::1
dns=2001:4860:4860::8888,2001:4860:4860::8844
may-fail=false

For DNS (both ipv4 and ipv6) I picked Google DNS.

This configuration was based on the Hetzner documentation on ipv6.

2026-01-17