On 4 October 2017 at 07:20, Phil Perry <pperry@xxxxxxxxxx> wrote:
> 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'
>
>
>
>
He's using systemd-networkd as he stated.
Best advice? Don't disable IPv6 ... configure your firewall properly.
Too much now depends on IPv6 to play silly buggers with a key component of
the network stack (eg default binds and network bonding).
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