Comment 3 for bug 1503680

Oct 08 10:00:19 odroid dhclient[587]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 15 (xid=0xe7223b64)
Oct 08 10:00:19 odroid sh[578]: DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 15 (xid=0xe7223b64)
Oct 08 10:00:34 odroid dhclient[587]: No DHCPOFFERS received.
Oct 08 10:00:34 odroid dhclient[587]: No working leases in persistent database - sleeping.
Oct 08 10:00:34 odroid sh[578]: No DHCPOFFERS received.
Oct 08 10:00:34 odroid sh[578]: No working leases in persistent database - sleeping.
Oct 08 10:00:35 odroid sshd[836]: Received SIGHUP; restarting.
Oct 08 10:00:35 odroid systemd[1]: Reloaded OpenBSD Secure Shell server.
Oct 08 10:00:35 odroid sh[578]: ifup: interface eth0 already configured
Oct 08 10:00:35 odroid sshd[836]: Server listening on 0.0.0.0 port 22.
Oct 08 10:00:35 odroid sshd[836]: Server listening on :: port 22.

Now i killed dhclient for eth0
No dhclient is running now
Now i plug the network cable

Oct 08 10:03:17 odroid kernel: [adjust link] -> eth: full-duplex
Oct 08 10:03:17 odroid kernel: [adjust link] -> eth: phy_speed <> priv_speed)
Oct 08 10:03:17 odroid kernel: [adjust link -> eth: am_adjust_link state change (new_state=true)
Oct 08 10:03:17 odroid kernel: libphy: 0:01 - Link is Up - 1000/Full
Oct 08 10:03:17 odroid kernel: IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready

Thats it, still no dhclient is running for eth0. @Oliver : no dhclient is started if the link becomes ready

cat /etc/network/interfaces.d/eth0
allow-hotplug eth0
iface eth0 inet dhcp