During the last couple of days, I have noticed that my ethernet connection drops about once every 5 minutes. The connection has worked for a number of years without problems before that. I am running a 64-bit Ubuntu 13.04.
The ethernet controller is a Realtek Semiconductor Co., Ltd. RTL8111/8168 PCI Express Gigabit Ethernet controller (rev 01).
This is the output from lscpi -v:
04:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168 PCI Express Gigabit Ethernet controller (rev 01) Subsystem: Gigabyte Technology Co., Ltd Motherboard Flags: bus master, fast devsel, latency 0, IRQ 44 I/O ports at c000 [size=256] Memory at f9000000 (64-bit, non-prefetchable) [size=4K] [virtual] Expansion ROM at fa800000 [disabled] [size=128K] Capabilities: <access denied> Kernel driver in use: r8169