Re: Problem I've been having with dhclient dhcp in Fedora27

[Andrei Borzenkov <arvidjaar gmail com>]

04.01.2018 23:59, dpreed deepplum com пишет:
> I've been having problems with NetworkManager dhcp on my Fedora27 Workstation 
> (desktop, wired).. Note, because I'm using VMs on that workstation, the 
> interface is a bridge (br0 with slave eno1).
>
> What seems to happen is this:
>
> Workstation wakes up from sleeping, reactivates connection.
>
> dhclient issues 4 DHCPDISCOVER tries, none of which get a response.
>
> the interface state changes "unknown-->timeout->done", and the DHCPv4 
> transaction is cancelled.
>
> A restart is scheduled for 120 seconds later.
>
> The restart 120 seconds later succeeds with DHCPDISCOVER, DHCPREQUEST, 
> DHCPOFFER, DHCPACK.

One possible reason is spanning tree on switch port, in which case there
is timeout before port goes in forwarding state.

> All the other machines served by my DHCP server have no problems at all, 
> however, they are MacBooks, various storage servers, and RaspberryPis.
>
> It seems to be that NetworkManager somehow interferes with the DHCPDISCOVER 
> after the workstation wakes up.
>
> The attached log file shows this sequence of events.
>
> (I'm wondering if there is a timing issue because the first dhclient call is 
> issued when eno1 is in the "unavailable" state, and before it is captured as a 
> slave to br0)
>
>
>
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