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

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, 

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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