Public bug reported:

<info> (eth0): carrier is OFF
Sep  2 20:00:32 cq71 NetworkManager[579]: <info> (eth0): new Ethernet device 
(driver: 'r8169' ifindex: 2)
Sep  2 20:00:32 cq71 NetworkManager[579]: <info> (eth0): exported as 
/org/freedesktop/NetworkManager/Devices/1
Sep  2 20:00:32 cq71 NetworkManager[579]: <info> (eth0): device state change: 
unmanaged -> unavailable (reason 'managed') [10 20 2]
Sep  2 20:00:32 cq71 NetworkManager[579]: <error> [1441216832.927980] 
[platform/nm-linux-platform.c:2250] link_change(): Netlink error changing link 
2:  <UP> mtu 0 (1) driver 'r8169' udi 
'/sys/devices/pci0000:00/0000:00:1c.1/0000:03:00.0/net/eth0': Invalid address 
for specified address family
Sep  2 20:00:32 cq71 NetworkManager[579]: <info> (eth0): preparing device

r8169 0000:03:00.0 eth0: RTL8102e at 0xffffc90004778000,
00:00:00:00:00:00, XID 04c00000 IRQ 27

03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8101E/RTL8102E 
PCI Express Fast Ethernet controller (rev 02)
        Subsystem: Hewlett-Packard Company Device 306c
        Kernel driver in use: r8169

  *-network DISABLED
       description: Ethernet interface
       product: RTL8101E/RTL8102E PCI Express Fast Ethernet controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:03:00.0
       logical name: eth0
       version: 02
       size: 100Mbit/s
       capacity: 100Mbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress msix vpd bus_master cap_list rom 
ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=r8169 
driverversion=2.3LK-NAPI duplex=full latency=0 link=no multicast=yes port=MII 
speed=100Mbit/s
       resources: irq:27 ioport:2000(size=256) memory:d4010000-d4010fff 
memory:d4000000-d400ffff memory:d5000000-d500ffff

i compiled the r8101 module from here:
http://www.realtek.com.tw/downloads/downloadsView.aspx?Langid=1&PNid=14&PFid=7&Level=5&Conn=4&DownTypeID=3&GetDown=false

after i put in a "cloned mac adress" the card is functional.
there is also an old bug report of this:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/256331

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Incomplete


** Tags: trusty

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https://bugs.launchpad.net/bugs/1491761

Title:
  Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8101E/RTL8102E
  PCI Express Fast Ethernet controller (rev 02) not working in 14.04 and
  15.04

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