On Mon, Mar 20, 2017 at 11:21:22AM +0100, Viktor S. Wold Eide wrote:
On Wed, Mar 15, 2017 at 7:22 PM, Beniamino Galvani <bgalvani redhat com> wrote: I did install and test dhcpcd separately. It seems like dhcpcd works as expected and provides ipv4 link local addresses when no dhcp reply is received, as expected. dhcpcd --version dhcpcd 6.10.1 Copyright (c) 2006-2016 Roy Marples I know that dhcpcd is no longer supported by NetworkManager, but I did test anyway. I changed the dhcp client for NetworkManager by configuring NetworkManager.conf: dhcp=dhcpcd The log reports the following, even if dhcpcd is installed and should be available: DHCP client 'dhcpcd' not available
Probably NM was not compiled with dhcpcd support.
As an alternative approach, I tried the NetworkManager hooking support, by scripts in NetworkManager/dispatcher.d/ It does not seem possible to have a script invoked when for example dhcp fails (only pre-up, up, dhcp renew, etc.). In other words, it seems a script is only invoked when configuration is successful or renewed. Did I overlook something?
AFAIK, it's not possible to implement such functionality using dispatcher scripts because they are called after the connection succeeds.
We have an open bugzilla [1] about supporting multiple IP methods (DHCP, link-local, static) at the same type for a connection. Probably that enhancement would solve your case, but at the moment I don't think anybody is working on it.Thanks for the info and the reference. Yes, that appears to be a reasonable enhancement to resolve the issue. It seems this issue with ipv4 link local addresses pops up from time to time. I was hoping for some way to achieve the behavior, which from what I understand is standard on (some) other platforms.
I agree, it's a useful feature, but the implementation will probably require a rework of the device state machine, which I suspect is not trivial. Beniamino
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