$ sudo lshw -C network
  *-network               
       description: Ethernet interface
       product: AR8131 Gigabit Ethernet
       vendor: Atheros Communications Inc.
       physical id: 0
       bus info: pci@0000:02:00.0
       logical name: eth0
       version: c0
       serial: 40:61:86:62:fe:cd
       size: 100Mbit/s
       capacity: 1Gbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress vpd bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=atl1c driverversion=1.0.1.0-NAPI duplex=full firmware=N/A latency=0 link=yes multicast=yes port=twisted pair speed=100Mbit/s
       resources: irq:43 memory:febc0000-febfffff ioport:e800(size=128)
$ sudo ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 40:61:86:62:fe:cd brd ff:ff:ff:ff:ff:ff
$ sudo dhclient -v
Internet Systems Consortium DHCP Client 4.1-ESV-R4
Copyright 2004-2011 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

No broadcast interfaces found - exiting.
$ grep eth0 /var/log/syslog
May 17 11:16:38 hua kernel: [    4.480691] ADDRCONF(NETDEV_UP): eth0: link is not ready
May 17 11:16:38 hua kernel: [    6.757023] atl1c 0000:02:00.0: atl1c: eth0 NIC Link is Up<100 Mbps Full Duplex>
May 17 11:16:39 hua avahi-daemon[1136]: Joining mDNS multicast group on interface eth0.IPv6 with address fe80::4261:86ff:fe62:fecd.
May 17 11:16:39 hua avahi-daemon[1136]: New relevant interface eth0.IPv6 for mDNS.
May 17 11:16:39 hua avahi-daemon[1136]: Registering new address record for fe80::4261:86ff:fe62:fecd on eth0.*.
May 17 11:16:40 hua NetworkManager[1159]:    SCPluginIfupdown: guessed connection type (eth0) = 802-3-ethernet
May 17 11:16:40 hua NetworkManager[1159]:    SCPlugin-Ifupdown: update_connection_setting_from_if_block: name:eth0, type:802-3-ethernet, id:Ifupdown (eth0), uuid: 681b428f-beaf-8932-dce4-687ed5bae28e
May 17 11:16:40 hua NetworkManager[1159]:    SCPlugin-Ifupdown: adding eth0 to iface_connections
May 17 11:16:40 hua NetworkManager[1159]:    SCPlugin-Ifupdown: adding iface eth0 to well_known_interfaces
May 17 11:16:40 hua NetworkManager[1159]:    SCPlugin-Ifupdown: devices added (path: /sys/devices/pci0000:00/0000:00:06.0/0000:02:00.0/net/eth0, iface: eth0)
May 17 11:16:40 hua NetworkManager[1159]: <info> (eth0): carrier is ON
May 17 11:16:40 hua NetworkManager[1159]: <info> (eth0): new Ethernet device (driver: 'atl1c' ifindex: 2)
May 17 11:16:40 hua NetworkManager[1159]: <info> (eth0): exported as /org/freedesktop/NetworkManager/Devices/0
May 17 11:16:41 hua avahi-daemon[1136]: Leaving mDNS multicast group on interface eth0.IPv6 with address fe80::4261:86ff:fe62:fecd.
May 17 11:16:41 hua avahi-daemon[1136]: Joining mDNS multicast group on interface eth0.IPv6 with address 2002:43ed:13df:0:a4f6:bc39:140e:57c0.
May 17 11:16:41 hua avahi-daemon[1136]: Registering new address record for 2002:43ed:13df:0:a4f6:bc39:140e:57c0 on eth0.*.
May 17 11:16:41 hua avahi-daemon[1136]: Withdrawing address record for fe80::4261:86ff:fe62:fecd on eth0.
May 17 11:16:41 hua avahi-daemon[1136]: Registering new address record for 2002:43ed:13df:0:4261:86ff:fe62:fecd on eth0.*.
May 17 11:20:31 hua avahi-daemon[1136]: Withdrawing address record for 2002:43ed:13df:0:a4f6:bc39:140e:57c0 on eth0.
May 17 11:20:31 hua avahi-daemon[1136]: Leaving mDNS multicast group on interface eth0.IPv6 with address 2002:43ed:13df:0:a4f6:bc39:140e:57c0.
May 17 11:20:31 hua avahi-daemon[1136]: Joining mDNS multicast group on interface eth0.IPv6 with address 2002:43ed:13df:0:4261:86ff:fe62:fecd.
May 17 11:20:31 hua avahi-daemon[1136]: Withdrawing address record for 2002:43ed:13df:0:4261:86ff:fe62:fecd on eth0.
May 17 11:20:31 hua avahi-daemon[1136]: Leaving mDNS multicast group on interface eth0.IPv6 with address 2002:43ed:13df:0:4261:86ff:fe62:fecd.
May 17 11:20:31 hua avahi-daemon[1136]: Joining mDNS multicast group on interface eth0.IPv6 with address fe80::4261:86ff:fe62:fecd.
May 17 11:20:31 hua avahi-daemon[1136]: Registering new address record for fe80::4261:86ff:fe62:fecd on eth0.*.
May 17 11:20:31 hua NetworkManager[1159]: <info> (eth0): carrier now OFF (device state 10)
May 17 11:20:31 hua avahi-daemon[1136]: Interface eth0.IPv6 no longer relevant for mDNS.
May 17 11:20:31 hua avahi-daemon[1136]: Leaving mDNS multicast group on interface eth0.IPv6 with address fe80::4261:86ff:fe62:fecd.
May 17 11:20:31 hua avahi-daemon[1136]: Withdrawing address record for fe80::4261:86ff:fe62:fecd on eth0.
May 17 11:20:31 hua NetworkManager[1159]: <info> (eth0): carrier now ON (device state 10)
May 17 11:20:31 hua kernel: [  239.691620] atl1c 0000:02:00.0: atl1c: eth0 NIC Link is Up<100 Mbps Full Duplex>
May 17 11:20:33 hua avahi-daemon[1136]: Joining mDNS multicast group on interface eth0.IPv6 with address fe80::4261:86ff:fe62:fecd.
May 17 11:20:33 hua avahi-daemon[1136]: New relevant interface eth0.IPv6 for mDNS.
May 17 11:20:33 hua avahi-daemon[1136]: Registering new address record for fe80::4261:86ff:fe62:fecd on eth0.*.
May 17 11:20:34 hua avahi-daemon[1136]: Leaving mDNS multicast group on interface eth0.IPv6 with address fe80::4261:86ff:fe62:fecd.
May 17 11:20:34 hua avahi-daemon[1136]: Joining mDNS multicast group on interface eth0.IPv6 with address 2002:43ed:13df:0:a4f6:bc39:140e:57c0.
May 17 11:20:34 hua avahi-daemon[1136]: Registering new address record for 2002:43ed:13df:0:a4f6:bc39:140e:57c0 on eth0.*.
May 17 11:20:34 hua avahi-daemon[1136]: Withdrawing address record for fe80::4261:86ff:fe62:fecd on eth0.
May 17 11:20:34 hua avahi-daemon[1136]: Registering new address record for 2002:43ed:13df:0:4261:86ff:fe62:fecd on eth0.*.
May 17 11:23:32 hua avahi-daemon[1136]: Registering new address record for 2002:43ed:13df:0:ecf1:bec:38fa:e69a on eth0.*.
May 17 12:03:31 hua NetworkManager[1144]:    SCPluginIfupdown: guessed connection type (eth0) = 802-3-ethernet
May 17 12:03:31 hua NetworkManager[1144]:    SCPlugin-Ifupdown: update_connection_setting_from_if_block: name:eth0, type:802-3-ethernet, id:Ifupdown (eth0), uuid: 681b428f-beaf-8932-dce4-687ed5bae28e
May 17 12:03:31 hua NetworkManager[1144]:    SCPlugin-Ifupdown: adding eth0 to iface_connections
May 17 12:03:31 hua NetworkManager[1144]:    SCPlugin-Ifupdown: adding iface eth0 to well_known_interfaces
May 17 12:03:31 hua NetworkManager[1144]:    SCPlugin-Ifupdown: devices added (path: /sys/devices/pci0000:00/0000:00:06.0/0000:02:00.0/net/eth0, iface: eth0)
May 17 12:03:31 hua kernel: [    6.220250] ADDRCONF(NETDEV_UP): eth0: link is not ready
May 17 12:03:31 hua kernel: [    6.549758] atl1c 0000:02:00.0: atl1c: eth0 NIC Link is Up<100 Mbps Full Duplex>
May 17 12:03:31 hua NetworkManager[1144]: <info> (eth0): carrier is ON
May 17 12:03:31 hua NetworkManager[1144]: <info> (eth0): new Ethernet device (driver: 'atl1c' ifindex: 2)
May 17 12:03:31 hua NetworkManager[1144]: <info> (eth0): exported as /org/freedesktop/NetworkManager/Devices/0
May 17 12:38:44 hua NetworkManager[1136]:    SCPluginIfupdown: guessed connection type (eth0) = 802-3-ethernet
May 17 12:38:44 hua NetworkManager[1136]:    SCPlugin-Ifupdown: update_connection_setting_from_if_block: name:eth0, type:802-3-ethernet, id:Ifupdown (eth0), uuid: 681b428f-beaf-8932-dce4-687ed5bae28e
May 17 12:38:44 hua NetworkManager[1136]:    SCPlugin-Ifupdown: adding eth0 to iface_connections
May 17 12:38:44 hua NetworkManager[1136]:    SCPlugin-Ifupdown: adding iface eth0 to well_known_interfaces
May 17 12:38:44 hua NetworkManager[1136]:    SCPlugin-Ifupdown: devices added (path: /sys/devices/pci0000:00/0000:00:06.0/0000:02:00.0/net/eth0, iface: eth0)
May 17 12:38:44 hua kernel: [    6.670136] ADDRCONF(NETDEV_UP): eth0: link is not ready
May 17 12:38:44 hua kernel: [    6.954573] atl1c 0000:02:00.0: atl1c: eth0 NIC Link is Up<100 Mbps Full Duplex>
May 17 12:38:44 hua NetworkManager[1136]: <info> (eth0): carrier is ON
May 17 12:38:44 hua NetworkManager[1136]: <info> (eth0): new Ethernet device (driver: 'atl1c' ifindex: 2)
May 17 12:38:44 hua NetworkManager[1136]: <info> (eth0): exported as /org/freedesktop/NetworkManager/Devices/0