On 04/10/17 03:46, Phil Manuel wrote: > Hi, > > If I disable ipv6 via the kernel command line, ipv6.disable=1, then > systemd-networkd fails to bring up any interfaces. > > Removing the option and networking works as expected. > > Phil. How are you controlling your network interfaces? I am using NM. Whilst not answering your question directly, I disable ipv6 in /etc/sysctl.conf. cat /etc/sysctl.conf # sysctl settings are defined through files in # /usr/lib/sysctl.d/, /run/sysctl.d/, and /etc/sysctl.d/. # # Vendors settings live in /usr/lib/sysctl.d/. # To override a whole file, create a new file with the same in # /etc/sysctl.d/ and put new settings there. To override # only specific settings, add a file with a lexically later # name in /etc/sysctl.d/ and put new settings there. # # For more information, see sysctl.conf(5) and sysctl.d(5). net.ipv4.ip_forward = 1 net.ipv6.conf.all.disable_ipv6 = 1 net.ipv6.conf.default.disable_ipv6 = 1 After updating, run 'sysctl -p' and 'dracut -f' Works for me.