I have the same problem once upgraded to 13.10. I have never had this problem before. It's a gigabyte motherboard.
lspci | grep -i ethernet 03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 03) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/771857 Title: Realtek 8168B (r8169) interface not working following suspend To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/771857/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs