Enable ipv6 on a Hetzner CoreOS server

Hetzner automatically assigns an ipv6 range to each server, but it does not assign an 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.

See also: Use direct ipv6 when possible and a fallback for ipv4

2026-01-17