[systemd-devel] How to turn off some network interface?

[Manuel Reimer]

Hello,

no, the IP is fixed.

I want to bring the interface down to reduce power usage. This machine 
has some special job where the LAN interface is only needed for about 
one minute a day.

The idea is to enable the interface, start the software which does some 
network interaction and after that disable the interface again.

Regards,

Manuel

On 09/13/2015 02:20 PM, Rosen, Rami wrote:
> Manuel,
>
> Just a short question:
> Is the interface you are talking about it configured
> to be a DHCP client ?  (if it is so, it can be related to
> networkd DHCP implementation, which may be configured/changed)
>
> Regards,
> Rami Rosen
> Intel Corporation
>
> -----Original Message-----
> From: systemd-devel [mailto:systemd-devel-bounces at lists.freedesktop.org] On Behalf Of Reindl Harald
> Sent: Sunday, September 13, 2015 2:41 PM
> To: systemd-devel at lists.freedesktop.org
> Subject: Re: [systemd-devel] How to turn off some network interface?
>
>
>
> Am 13.09.2015 um 13:28 schrieb Rosen, Rami:
>> What do you mean by stopping networkd, can you elaborate a bit about what you want to achieve?
>>
>> If you want to stop the service, simply run "systemctl stop
>> systemd-networkd".
>>
>> The after that ifconfig command, it won't start.
>>
>> If you want to disable one network interface (let's say eth0), then go
>> to the proper configuration file under /etc/systemd/networkd and
>> comment/disable it, and restart the networkd service by:
>>
>> systemctl restart systemd-networkd
>
> well, that's a little unfortune compared to a setup not using systemd-networkd where you can *temporary* disable interfaces just with "ifdown lan4" without changing a configuration
>
> the point is *temporary*, changing the config means it would be disabled at the next boot too, on a machine acting as router/switch temporary disable interfaces makes a lot of sense to disconnect a client from the network
>
>> -----Original Message-----
>> From: systemd-devel
>> [mailto:systemd-devel-bounces at lists.freedesktop.org] On Behalf Of
>> Manuel Reimer
>> Sent: Sunday, September 13, 2015 11:55 AM
>> To: systemd-devel at lists.freedesktop.org
>> Subject: [systemd-devel] How to turn off some network interface?
>>
>> Hello,
>>
>> it seems to be impossible to just stop networkd (keeps starting itself again).
>>
>> If I use "ifconfig" to turn off one NIC, then networkd immediately restarts it.
>>
>> What do I have to do to gain back control over my network interfaces? I want to be able to turn off one interface.
>>
>> Thanks in advance
>
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