Same issue here ; conditions:

- 02:00.0 Ethernet controller: Qualcomm Atheros AR8151 v2.0 Gigabit Ethernet 
(rev c0)
        Subsystem: Lenovo Device 21f1
        Kernel driver in use: atl1c
- Networkmanager 0.9.8.0 enabled
- Linux  3.8.0-19-generic #30-Ubuntu SMP Wed May 1 16:35:23 UTC 2013 x86_64 
x86_64 x86_64 GNU/Linux
- cable plugged in

As soon I generate some traffic, my connection hangs and number of
dropped packets on eth0 is increasing rapidly.

Syslog doesn't show any errors when the connection hangs / packet are
dropped.

I'll enable debug logging for network manager and update my comment...

When I disable the netwokmanager, and assign ip/dns manually, everything
is working fine => driver OK.

Steven

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https://bugs.launchpad.net/bugs/1129251

Title:
  Ethernet connection - damaged packets

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