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

02.10.2017 18:22, Olaf Hering пишет:
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. 

RFC requires that when upon lease expiration client stop using address
(actually it literally says "stop any network activity") and return to
initial state of acquiring address.

Defaulting to fail the
interface from NM point of view is certainly undesired behaviour.

That is what is required by RFC. You cannot continue to use address
allocated by DHCP server after lease has expired unless you succeeded in
extending (renewing) lease.

A change in the default NetworkManager.conf can switch it off for
default connections leaving the feature there if needed:



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