i am having all sorts of weird things happening with this nic as well in 
Xubuntu 13.10. Sometimes websites cant even be resolved like github.com. It's 
very strange, it's autoloading the r8169 driver but my chipset is 
sudo lshw -C network
[sudo] password for ubu: 
  *-network               
       description: Ethernet interface
       product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:03:00.0
       logical name: eth2
       version: 0c
       serial: d4:3d:7e:e2:27:3b
       size: 100Mbit/s
       capacity: 1Gbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet 
physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=r8169 
driverversion=2.3LK-NAPI duplex=full firmware=rtl8168g-2_0.0.1 02/06/13 
ip=192.168.0.13 latency=0 link=yes multicast=yes port=MII speed=100Mbit/s
       resources: irq:43 ioport:d000(size=256) memory:f7c00000-f7c00fff 
memory:f0000000-f0003fff

03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 
PCI Express Gigabit Ethernet Controller (rev 0c)
        Subsystem: Micro-Star International Co., Ltd. Device 7850
        Flags: bus master, fast devsel, latency 0, IRQ 43
        I/O ports at d000 [size=256]
        Memory at f7c00000 (64-bit, non-prefetchable) [size=4K]
        Memory at f0000000 (64-bit, prefetchable) [size=16K]
        Capabilities: [40] Power Management version 3
        Capabilities: [50] MSI: Enable+ Count=1/1 Maskable- 64bit+
        Capabilities: [70] Express Endpoint, MSI 01
        Capabilities: [b0] MSI-X: Enable- Count=4 Masked-
        Capabilities: [d0] Vital Product Data
        Capabilities: [100] Advanced Error Reporting
        Capabilities: [140] Virtual Channel
        Capabilities: [160] Device Serial Number 01-00-00-00-68-4c-e0-00
        Capabilities: [170] Latency Tolerance Reporting
        Kernel driver in use: r8169

sudo ethtool eth2
Settings for eth2:
        Supported ports: [ TP MII ]
        Supported link modes:   10baseT/Half 10baseT/Full 
                                100baseT/Half 100baseT/Full 
                                1000baseT/Half 1000baseT/Full 
        Supported pause frame use: No
        Supports auto-negotiation: Yes
        Advertised link modes:  10baseT/Half 10baseT/Full 
                                100baseT/Half 100baseT/Full 
                                1000baseT/Full 
        Advertised pause frame use: Symmetric Receive-only
        Advertised auto-negotiation: Yes
        Link partner advertised link modes:  10baseT/Half 10baseT/Full 
                                             100baseT/Half 100baseT/Full 
        Link partner advertised pause frame use: Symmetric Receive-only
        Link partner advertised auto-negotiation: Yes
        Speed: 100Mb/s
        Duplex: Full
        Port: MII
        PHYAD: 0
        Transceiver: internal
        Auto-negotiation: on
        Supports Wake-on: pumbg
        Wake-on: g
        Current message level: 0x00000033 (51)
                               drv probe ifdown ifup
        Link detected: yes


cat /var/log/syslog | grep r8169
Feb  1 21:15:32 saucy-haswell kernel: [    0.401021] r8169 Gigabit Ethernet 
driver 2.3LK-NAPI loaded
Feb  1 21:15:32 saucy-haswell kernel: [    0.401026] r8169 0000:03:00.0: can't 
disable ASPM; OS doesn't have ASPM control
Feb  1 21:15:32 saucy-haswell kernel: [    0.406345] r8169 0000:03:00.0: irq 43 
for MSI/MSI-X
Feb  1 21:15:32 saucy-haswell kernel: [    0.406458] r8169 0000:03:00.0 eth0: 
RTL8168g/8111g at 0xffffc90000c38000, d4:3d:7e:e2:27:3b, XID 0c000800 IRQ 43
Feb  1 21:15:32 saucy-haswell kernel: [    0.406459] r8169 0000:03:00.0 eth0: 
jumbo features [frames: 9200 bytes, tx checksumming: ko]
Feb  1 21:15:32 saucy-haswell NetworkManager[718]: <info> (eth2): new Ethernet 
device (driver: 'r8169' ifindex: 2)
Feb  1 21:15:32 saucy-haswell kernel: [    1.863210] r8169 0000:03:00.0 eth2: 
link down
Feb  1 21:15:32 saucy-haswell kernel: [    1.863216] r8169 0000:03:00.0 eth2: 
link down
Feb  1 21:15:35 saucy-haswell kernel: [    4.502177] r8169 0000:03:00.0 eth2: 
link up
Feb  1 21:15:36 saucy-haswell kernel: [    5.503225] r8169 0000:03:00.0 eth2: 
link down
Feb  1 21:15:40 saucy-haswell kernel: [    8.987381] r8169 0000:03:00.0 eth2: 
link up
Feb  1 21:15:41 saucy-haswell kernel: [    9.988401] r8169 0000:03:00.0 eth2: 
link down
Feb  1 21:15:45 saucy-haswell kernel: [   14.389038] r8169 0000:03:00.0 eth2: 
link up
Feb  1 21:15:46 saucy-haswell kernel: [   15.374854] r8169 0000:03:00.0 eth2: 
link down
Feb  1 21:15:50 saucy-haswell kernel: [   18.879517] r8169 0000:03:00.0 eth2: 
link up
Feb  1 21:15:51 saucy-haswell kernel: [   19.881021] r8169 0000:03:00.0 eth2: 
link down
Feb  1 21:15:55 saucy-haswell kernel: [   24.398022] r8169 0000:03:00.0 eth2: 
link up
Feb  1 21:15:56 saucy-haswell kernel: [   25.391157] r8169 0000:03:00.0 eth2: 
link down
Feb  1 21:15:59 saucy-haswell kernel: [   27.986939] r8169 0000:03:00.0 eth2: 
link up
Feb  1 21:28:47 saucy-haswell kernel: [    0.402081] r8169 Gigabit Ethernet 
driver 2.3LK-NAPI loaded
Feb  1 21:28:47 saucy-haswell kernel: [    0.402086] r8169 0000:03:00.0: can't 
disable ASPM; OS doesn't have ASPM control
Feb  1 21:28:47 saucy-haswell kernel: [    0.406869] r8169 0000:03:00.0: irq 43 
for MSI/MSI-X
Feb  1 21:28:47 saucy-haswell kernel: [    0.406980] r8169 0000:03:00.0 eth0: 
RTL8168g/8111g at 0xffffc90000c38000, d4:3d:7e:e2:27:3b, XID 0c000800 IRQ 43
Feb  1 21:28:47 saucy-haswell kernel: [    0.406982] r8169 0000:03:00.0 eth0: 
jumbo features [frames: 9200 bytes, tx checksumming: ko]
Feb  1 21:28:47 saucy-haswell NetworkManager[734]: <info> (eth2): new Ethernet 
device (driver: 'r8169' ifindex: 2)
Feb  1 21:28:47 saucy-haswell kernel: [    1.575879] r8169 0000:03:00.0 eth2: 
link down
Feb  1 21:28:47 saucy-haswell kernel: [    1.575927] r8169 0000:03:00.0 eth2: 
link down
Feb  1 21:28:50 saucy-haswell kernel: [    4.245928] r8169 0000:03:00.0 eth2: 
link up
Feb  1 21:28:51 saucy-haswell kernel: [    5.230723] r8169 0000:03:00.0 eth2: 
link down
Feb  1 21:28:54 saucy-haswell kernel: [    8.751562] r8169 0000:03:00.0 eth2: 
link up
Feb  1 21:28:55 saucy-haswell kernel: [    9.736904] r8169 0000:03:00.0 eth2: 
link down
Feb  1 21:29:00 saucy-haswell kernel: [   14.101403] r8169 0000:03:00.0 eth2: 
link up
Feb  1 21:29:01 saucy-haswell kernel: [   15.102398] r8169 0000:03:00.0 eth2: 
link down
Feb  1 21:29:04 saucy-haswell kernel: [   18.622758] r8169 0000:03:00.0 eth2: 
link up
Feb  1 21:29:05 saucy-haswell kernel: [   19.608568] r8169 0000:03:00.0 eth2: 
link down
Feb  1 21:29:10 saucy-haswell kernel: [   24.161134] r8169 0000:03:00.0 eth2: 
link up
Feb  1 21:29:11 saucy-haswell kernel: [   25.162696] r8169 0000:03:00.0 eth2: 
link down
Feb  1 21:29:13 saucy-haswell kernel: [   27.800400] r8169 0000:03:00.0 eth2: 
link up
Feb  1 21:51:05 saucy-haswell kernel: [ 1338.821698] r8169 0000:03:00.0 eth2: 
link down
Feb  1 21:51:08 saucy-haswell kernel: [ 1341.341979] r8169 0000:03:00.0 eth2: 
link up
Feb  1 21:51:09 saucy-haswell kernel: [ 1342.340383] r8169 0000:03:00.0 eth2: 
link down
Feb  1 21:51:12 saucy-haswell kernel: [ 1345.783690] r8169 0000:03:00.0 eth2: 
link up
Feb  1 21:51:13 saucy-haswell kernel: [ 1346.783681] r8169 0000:03:00.0 eth2: 
link down
Feb  1 21:51:18 saucy-haswell kernel: [ 1351.504926] r8169 0000:03:00.0 eth2: 
link up
Feb  1 21:51:19 saucy-haswell kernel: [ 1352.505480] r8169 0000:03:00.0 eth2: 
link down
Feb  1 21:51:22 saucy-haswell kernel: [ 1356.037329] r8169 0000:03:00.0 eth2: 
link up
Feb  1 21:51:23 saucy-haswell kernel: [ 1357.032605] r8169 0000:03:00.0 eth2: 
link down
Feb  1 21:51:28 saucy-haswell kernel: [ 1361.496623] r8169 0000:03:00.0 eth2: 
link up
Feb  1 21:51:29 saucy-haswell kernel: [ 1362.481940] r8169 0000:03:00.0 eth2: 
link down
Feb  1 21:51:32 saucy-haswell kernel: [ 1365.161561] r8169 0000:03:00.0 eth2: 
link up

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https://bugs.launchpad.net/bugs/1266725

Title:
  10ec:8168 [Intel DP67BG] Disconnects in realtek  RTL8111/8168/8411 NIC

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