Wired connection is lost periodically and not reestablished until rebooting. I bought desktop and install fresh Ubuntu 12.10. My network card with Atheros Communications Inc. AR8161 Gigabit Ethernet wasn't define automatically but I install drivers from backports.
sudo apt-get install linux-backports-modules-cw-3.6-precise-generic sudo modprobe alx
Now internet work just fine but sometimes connection is lost and not recovery until rebooting computer. Is it possible fix this behavior?
Update: I found in syslog next line:
kernel: [82944.115285] ICMPv6: ND: ndisc_build_skb failed to allocate an skb, err=-11
Could it be reason of instability?