Re: Loss of Network Adress is DHCP Server failed for some hours

[Francesco Giudici <fgiudici redhat com>]

On 02/10/2017 17:22, Olaf Hering wrote:
> On Mon, Oct 02, Francesco Giudici wrote:
>
> > With that anyway you miss the option of having different
> > connections that could fallback if the "primary" one with dhcp
> > fails.
>
> How is it a failure if the DHCP server disappears, perhaps right
> after it provided a lease? Well, there is likely some blurb in the
> RFCs about what must be done when the lease expired. Defaulting to
> fail the interface from NM point of view is certainly undesired
> behaviour.

Yeah, you can only manage it with the dhcp-timeout value.
> > A change in the default NetworkManager.conf can switch it off
> > for default connections leaving the feature there if needed: 
> > (https://bugzilla.redhat.com/show_bug.cgi?id=1350830#c7).
>
> -EPERM

Sorry, my fault.
Here what I meant:
"It is possible to set a global default for ipv4.dhcp-timeout, see 'man
NetworkManager.conf' for the details. For example you could add the
following to /etc/NetworkManager/conf.d/10-persistent-dhcp.conf:

 [connection-eth-dhcp-timeout]
 match-device=type:ethernet
 ipv4.dhcp-timeout=2147483647

so that all ethernet connections with unset timeout
(ipv4.dhcp-timeout=0) inherit the new value."

> Olaf