RE: Need to send the dhclient6 to background in Centos 8

[Jorge Perez Higuera <joperez arsys es>]

If the dhcp server does not send an ipv6 lease IP, dhclient ipv6 process tries to get that ip during 30 
seconds. That causes (i can see that via systemd-analyze blame) the startup of the  
NetworkManager-wait-online service is delayed, delaying the network-online.target
I have services depending of this target and that delay causes some troubles to me.

-----Mensaje original-----
De: Thomas Haller [mailto:thaller redhat com] 
Enviado el: martes, 8 de octubre de 2019 14:00
Para: Jorge Perez Higuera; networkmanager-list gnome org
Asunto: Re: Need to send the dhclient6 to background in Centos 8

On Tue, 2019-10-08 at 11:37 +0000, Jorge Perez Higuera via networkmanager-list wrote:
> Hi all. I need some help
>  
> I need to send the dhclient ipv6 process to background (I use
> dhcp=dhclient)
> I know it can be done passing the –nw parameter via dhclient but i 
> don’t know how to pass this to dhclient via NetworkManager Also in 
> Centos 8 it start in foreground (-d parameter)
>  
> Is there any way to do this?
> Is is posible via internal client?
>  
> NetworkManager 1.14.0
> Centos 8
>  
> Thank you

Hi,

when NetworkManager uses dhclient as its DHCP plugin, then the process is controlled by NetworkManager. In 
that case, NetworkManager will always spawn the process in the background. That is regardless whether 
NetworkManager itself is in the background or not). Anyway, the way NetworkManager spawns this process is of 
little concern to the user.

In fact, when using NetworkManager you usually would be not concerned with dhclient at all. The process is 
for the most part an implementation detail of how NetworkManager does DHCP.

Which problem are you trying to solve?

best,
Thomas