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[Ivan Frederiks <1132156@xxxxxxxxxxxxxxxxxx>]

I found solution for this issue, at least for my case: one has to set
correct MAC-address before bringing up the interface.

On my board RTL8102E works without EEPROM, so MAC value is unpredictable. In many cases this random value has multicast bit set to 1. This fact breaks driver and (or) TCP stack operation:
* r8169 reports that link is down
* r8101 reports that link is OK, but Linux TCP stack ignores packets with multicast destination MAC

Overall behavior of r8169 seems to be better than r8101's: second one
sometimes stops to transceive packets (once per several hours of
continuous TCP traffic, average load ~30Mbps down). In same conditions
r8169 works without issues (or at least I think so? (c)).

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https://bugs.launchpad.net/bugs/1132156

Title:
  Realktek r8169 driver unrelaible with r8101/02

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  Support for the realtek r8101 Ethernet interfac is handled by r8169 driver on Ubuntu Precise. However, the link is very unreliable and fails to connect most of the time. Speed negotiates down to 10Mbit/sec usually, half duplex, even when using the workaround 'sudo ethtool -s eth0 autoneg off'
  There seems a problem with the link speed negotiation?
  Won't connect at higher speeds at all. 
  It's not possible to use the r8101 driver previously available as this is supplied by Realtek only for 2.4/2.6 kernels. It won't compile under 3.2.x

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.2.0-38-generic-pae 3.2.0-38.61
  ProcVersionSignature: Ubuntu 3.2.0-38.61-generic-pae 3.2.37
  Uname: Linux 3.2.0-38-generic-pae i686
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  AplayDevices:
   **** List of PLAYBACK Hardware Devices ****
   card 0: Intel [HDA Intel], device 0: ALC662 rev1 Analog [ALC662 rev1 Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  ApportVersion: 2.0.1-0ubuntu17.1
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  oliver     2844 F.... pulseaudio
   /dev/snd/controlC1:  oliver     2844 F.... pulseaudio
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xfe938000 irq 44'
     Mixer name	: 'Realtek ALC662 rev1'
     Components	: 'HDA:10ec0662,10ec0662,00100101'
     Controls      : 20
     Simple ctrls  : 11
  Card1.Amixer.info:
   Card hw:1 'U0xeb1a0x2776'/'USB Device 0xeb1a:0x2776 at usb-0000:00:1d.7-7, high speed'
     Mixer name	: 'USB Mixer'
     Components	: 'USBeb1a:2776'
     Controls      : 2
     Simple ctrls  : 1
  Card1.Amixer.values:
   Simple mixer control 'Mic',0
     Capabilities: cvolume cvolume-joined cswitch cswitch-joined penum
     Capture channels: Mono
     Limits: Capture 0 - 63
     Mono: Capture 61 [97%] [61.00dB] [off]
  Date: Sat Feb 23 16:27:14 2013
  HibernationDevice: RESUME=UUID=76935e71-c474-4de4-b9d4-9fb12d8b1d34
  MachineType: czc czc
  MarkForUpload: True
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-38-generic-pae root=UUID=309c2426-7a29-4c52-a7bc-b41ed2a25184 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.2.0-38-generic-pae N/A
   linux-backports-modules-3.2.0-38-generic-pae  N/A
   linux-firmware                                1.79.1
  RfKill:
   0: phy0: Wireless LAN
   	Soft blocked: no
   	Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: Upgraded to precise on 2012-06-17 (251 days ago)
  dmi.bios.date: 05/18/2009
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 080015
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: czc
  dmi.board.vendor: czc
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 10
  dmi.chassis.vendor: czc
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr080015:bd05/18/2009:svnczc:pnczc:pvr1.0:rvnczc:rnczc:rvr1.0:cvnczc:ct10:cvr1.0:
  dmi.product.name: czc
  dmi.product.version: 1.0
  dmi.sys.vendor: czc

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