I have the same hardware here. No problems. I would look at your cable or target devices.
A good way to check for problems (eth0 is my RTL8168):
user@my_host:~$ netstat -i
Kernel Interface table
Iface MTU Met RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR Flg
eth0 1500 0 1975313 0 0 0 1098856 0 0 0 BMRU
lo 65536 0 17738 0 0 0 17738 0 0 0 LRU
(The columns donāt line up on the terminal either:) All of the error counters should be 0.
Here is another:
user@my_host:~$ ifconfig eth0
eth0 Link encap:Ethernet HWaddr xxx
inet addr:192.168.101.202 Bcast:192.168.101.255 Mask:255.255.255.0
inet6 addr: fe80::182e:2781:d6f4:87e4/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1975342 errors:0 dropped:0 overruns:0 frame:0
TX packets:1098880 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:2029175372 (2.0 GB) TX bytes:312141046 (312.1 MB)
PCI Bus 02:
02:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 06)
Subsystem: ASUSTeK Computer Inc. P8P67 and other motherboards [1043:8432]
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx+
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0, Cache Line Size: 64 bytes
Interrupt: pin A routed to IRQ 27
Region 0: I/O ports at c800 [size=256]
Region 2: Memory at fdfff000 (64-bit, prefetchable) [size=4K]
Region 4: Memory at fdff8000 (64-bit, prefetchable) [size=16K]
Capabilities: <access denied>
Kernel driver in use: r8169
Kernel modules: r8169