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Thread: Ethernet Disabled

  1. #1
    Join Date
    May 2011

    Ethernet Disabled

    I have been using only wireless for a long time but I am sure the ethernet worked some time but now it does not. I recently did a clean install of Precise. I dont know if that broke the ethernet. Wireless works fine but I need ethernet at a place where there is no wireless.

    lt1:~$ sudo lshw -class network
    description: Wireless interface
    product: BCM4312 802.11b/g LP-PHY
    vendor: Broadcom Corporation
    physical id: 0
    bus info: pci@0000:02:00.0
    logical name: eth2
    version: 01
    serial: 00:21:00:8d:8d:53
    width: 64 bits
    clock: 33MHz
    capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
    configuration: broadcast=yes driver=wl0 driverversion= ip= latency=0 multicast=yes wireless=IEEE 802.11bg
    resources: irq:16 memory:db600000-db603fff
    *-network DISABLED
    description: Ethernet interface
    product: RTL8101E/RTL8102E PCI Express Fast Ethernet controller
    vendor: Realtek Semiconductor Co., Ltd.
    physical id: 0
    bus info: pci@0000:03:00.0
    logical name: eth0
    version: 02
    size: 100Mbit/s
    capacity: 100Mbit/s
    width: 64 bits
    clock: 33MHz
    capabilities: pm msi pciexpress msix vpd bus_master cap_list rom ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
    configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=full firmware=N/A latency=0 link=no multicast=yes port=MII speed=100Mbit/s
    resources: irq:47 ioport:6000(size=256) memory:d1410000-d1410fff memory:d1400000-d140ffff memory:d1420000-d142ffff

    If I go to System Settings - Network, I see Wired as Unmanaged and has hardware address 00:00:00:00:00:00

    How do I fix this? Thanks
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  2. #2
    Join Date
    Aug 2005
    South Carolina, USA
    Ubuntu 17.04 Zesty Zapus

    Re: Ethernet Disabled

    Let's have a look at:
    cat /etc/network/interfaces
    dmesg | grep eth0
    "Oh, Ubuntu, you are my favorite Linux-based operating system" --Dr. Sheldon Cooper, Ph.D.


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