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Thread: DNS lookup fails all of a sudden (Precise Pangolin)

  1. #1
    Join Date
    May 2012
    Beans
    8

    DNS lookup fails all of a sudden (Precise Pangolin)

    I own an HP Pavillion p6520y with Ubuntu 12.04 installed. This morning, I was unable to access the internet. Chromium tells me "The server at www.google.com can't be found, because the DNS lookup failed." Firefox says "Server not found". Because I have had issues with Ubuntu and networking in the past, I initially thought this was a driver issue, but it didn't match the symptoms I had encountered previously. I contacted my ISP and they ran some diagnostics. The cable modem was running fine and they could see my computer. I narrowed down the cause to be something on my system. I ran a few live CDs (Crunchbang, Mint, etc.) to see if it was the installed OS. Unfortunately, none of them could access the internet either. I was able to connect from an ancient laptop running Debian Squeeze. I downloaded the driver (RealTek r616808.032.00), copied it to my desktop and installed it to no avail.

    Here are some of my system specifics:

    Code:
    dmesg | tail
    [ 21.661675] ADDRCONF(NETDEV_UP): wlan0: link is not ready
    [ 21.835451] r8168: eth0: link down
    [ 21.836408] ADDRCONF(NETDEV_UP): eth0: link is not ready
    [ 21.837469] ADDRCONF(NETDEV_UP): eth0: link is not ready
    [ 22.033587] vboxpci: IOMMU not found (not registered)
    [ 23.090082] radeon 0000:01:05.0: texture bo too small (1600 900 26 0 -> 5785600 have 5763072)
    [ 23.090086] radeon 0000:01:05.0: alignments 1600 64 8 256
    [ 23.090088] [drm:radeon_cs_ioctl] *ERROR* Invalid command stream !
    [ 23.450313] r8168: eth0: link up
    [ 23.450984] ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
    [ 23.832029] r8168: eth0: link up
    [ 24.201765] init: plymouth-stop pre-start process (1555) terminated with status 1
    [ 34.176032] eth0: no IPv6 routers present
    Code:
    lfconfig
    eth0 Link encap:Ethernet HWaddr 78:e7:d1:ca:3d:ae
    inet addr:68.199.112.124 Bcast:68.199.115.255 Mask:255.255.252.0
    inet6 addr: fe80::7ae7:d1ff:feca:3dae/64 Scope:Link
    UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
    RX packets:750 errors:0 dropped:0 overruns:0 frame:0
    TX packets:121 errors:0 dropped:0 overruns:0 carrier:0
    collisions:0 txqueuelen:1000
    RX bytes:45564 (45.5 KB) TX bytes:14235 (14.2 KB)
    Interrupt:42 Base address:0x6000

    lo Link encap:Local Loopback
    inet addr:127.0.0.1 Mask:255.0.0.0
    inet6 addr: ::1/128 Scope:Host
    UP LOOPBACK RUNNING MTU:16436 Metric:1
    RX packets:36 errors:0 dropped:0 overruns:0 frame:0
    TX packets:36 errors:0 dropped:0 overruns:0 carrier:0
    collisions:0 txqueuelen:0
    RX bytes:2174 (2.1 KB) TX bytes:2174 (2.1 KB)
    Code:
    lsmod | grep r8168
    r8168 244911 0
    Code:
    lspci
    00:00.0 Host bridge: Advanced Micro Devices [AMD] RS880 Host Bridge
    00:01.0 PCI bridge: Advanced Micro Devices [AMD] RS780/RS880 PCI to PCI bridge (int gfx)
    00:05.0 PCI bridge: Advanced Micro Devices [AMD] RS780/RS880 PCI to PCI bridge (PCIE port 1)
    00:0a.0 PCI bridge: Advanced Micro Devices [AMD] RS780/RS880 PCI to PCI bridge (PCIE port 5)
    00:11.0 RAID bus controller: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 SATA Controller [Non-RAID5 mode]
    00:12.0 USB controller: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 USB OHCI0 Controller
    00:12.1 USB controller: Advanced Micro Devices [AMD] nee ATI SB7x0 USB OHCI1 Controller
    00:12.2 USB controller: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 USB EHCI Controller
    00:13.0 USB controller: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 USB OHCI0 Controller
    00:13.1 USB controller: Advanced Micro Devices [AMD] nee ATI SB7x0 USB OHCI1 Controller
    00:13.2 USB controller: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 USB EHCI Controller
    00:14.0 SMBus: Advanced Micro Devices [AMD] nee ATI SBx00 SMBus Controller (rev 3c)
    00:14.2 Audio device: Advanced Micro Devices [AMD] nee ATI SBx00 Azalia (Intel HDA)
    00:14.3 ISA bridge: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 LPC host controller
    00:14.4 PCI bridge: Advanced Micro Devices [AMD] nee ATI SBx00 PCI to PCI Bridge
    00:14.5 USB controller: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 USB OHCI2 Controller
    00:18.0 Host bridge: Advanced Micro Devices [AMD] Family 10h Processor HyperTransport Configuration
    00:18.1 Host bridge: Advanced Micro Devices [AMD] Family 10h Processor Address Map
    00:18.2 Host bridge: Advanced Micro Devices [AMD] Family 10h Processor DRAM Controller
    00:18.3 Host bridge: Advanced Micro Devices [AMD] Family 10h Processor Miscellaneous Control
    00:18.4 Host bridge: Advanced Micro Devices [AMD] Family 10h Processor Link Control
    01:05.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI RS880 [Radeon HD 4200]
    02:00.0 Network controller: Ralink corp. RT3090 Wireless 802.11n 1T/1R PCIe
    03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 03)
    04:06.0 FireWire (IEEE 1394): VIA Technologies, Inc. VT6306/7/8 [Fire II(M)] IEEE 1394 OHCI Controller (rev c0)
    Code:
    uname -a
    Linux ubuntu 3.2.0-29-generic #46-Ubuntu SMP Fri Jul 27 17:03:23 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

  2. #2
    Join Date
    Feb 2009
    Location
    Dallas, TX
    Beans
    6,358
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: DNS lookup fails all of a sudden (Precise Pangolin)

    Hi ChadHerman. Welcome to the forums

    Could you post the result of these commands?
    Code:
    lspci -nnk | grep -iA2 eth
    
    sudo lshw -C network
    
    cat /etc/network/interfaces
    Regards.

  3. #3
    Join Date
    May 2012
    Beans
    8

    Re: DNS lookup fails all of a sudden (Precise Pangolin)

    Quote Originally Posted by papibe View Post
    Hi ChadHerman. Welcome to the forums

    Could you post the result of these commands?
    Code:
    lspci -nnk | grep -iA2 eth
    
    sudo lshw -C network
    
    cat /etc/network/interfaces
    Regards.
    Hi papibe. Thanks for your response. Here's the output:
    Code:
    lspci -nnk | grep -iA2 eth
    03:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller [10ec:8168] (rev 03)
    Subsystem: Hewlett-Packard Company Device [103c:2a92]
    Kernel driver in use: r8168
    Code:
    sudo lshw -C network
    *-network DISABLED
    description: Wireless interface
    product: RT3090 Wireless 802.11n 1T/1R PCIe
    vendor: Ralink corp.
    physical id: 0
    bus info: pci@0000:02:00.0
    logical name: wlan0
    version: 00
    serial: 70:f1:a1:8f:8c:6b
    width: 32 bits
    clock: 33MHz
    capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
    configuration: broadcast=yes driver=rt2800pci driverversion=3.2.0-29-generic firmware=N/A latency=0 link=no multicast=yes wireless=IEEE 802.11bgn
    resources: irq:17 memory:fe9f0000-fe9fffff
    *-network
    description: Ethernet interface
    product: RTL8111/8168B PCI Express Gigabit Ethernet controller
    vendor: Realtek Semiconductor Co., Ltd.
    physical id: 0
    bus info: pci@0000:03:00.0
    logical name: eth0
    version: 03
    serial: 78:e7:d1:ca:3d:ae
    size: 100Mbit/s
    capacity: 1Gbit/s
    width: 64 bits
    clock: 33MHz
    capabilities: pm msi pciexpress msix vpd bus_master cap_list rom ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
    configuration: autonegotiation=on broadcast=yes driver=r8168 driverversion=8.032.00-NAPI duplex=full ip=68.199.112.124 latency=0 link=yes multicast=yes port=twisted pair speed=100Mbit/s
    resources: irq:42 ioport:d800(size=256) memory:feaff000-feafffff memory:fdffc000-fdffffff memory:feac0000-feadffff
    Code:
    cat /etc/network/interfaces
    # This file describes the network interfaces available on your system
    # and how to activate them. For more information, see interfaces(5).

    # The loopback network interface
    auto lo
    iface lo inet loopback

    # The primary network interface
    auto eth0
    #NetworkManager
    #iface eth0 inet dhcp

  4. #4
    Join Date
    Feb 2009
    Location
    Dallas, TX
    Beans
    6,358
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: DNS lookup fails all of a sudden (Precise Pangolin)

    Comment the line 'auto eth0' on your interfaces, so it looks like this:
    Code:
    # This file describes the network interfaces available on your system
    # and how to activate them. For more information, see interfaces(5).
    
    # The loopback network interface
    auto lo
    iface lo inet loopback
    
    # The primary network interface
    #auto eth0
    #NetworkManager
    #iface eth0 inet dhcp
    Then restart your network:
    Code:
    sudo service network-manager stop
    
    sudo service network-manager start
    Let us know how it goes.
    Regards.

  5. #5
    Join Date
    May 2012
    Beans
    8

    Re: DNS lookup fails all of a sudden (Precise Pangolin)

    Quote Originally Posted by papibe View Post
    Comment the line 'auto eth0' on your interfaces, so it looks like this:
    Code:
    # This file describes the network interfaces available on your system
    # and how to activate them. For more information, see interfaces(5).
    
    # The loopback network interface
    auto lo
    iface lo inet loopback
    
    # The primary network interface
    #auto eth0
    #NetworkManager
    #iface eth0 inet dhcp
    Then restart your network:
    Code:
    sudo service network-manager stop
    
    sudo service network-manager start
    Let us know how it goes.
    Regards.
    papibe,

    I tried it, but the DNS lookup still fails.

  6. #6
    Join Date
    Feb 2009
    Location
    Dallas, TX
    Beans
    6,358
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: DNS lookup fails all of a sudden (Precise Pangolin)

    Try this:
    Code:
    sudo ifconfig eth0 up
    and then again:
    Code:
    sudo service networking-manager restart
    Tell us how it goes.
    Regards.

  7. #7
    Join Date
    May 2012
    Beans
    8

    Re: DNS lookup fails all of a sudden (Precise Pangolin)

    Quote Originally Posted by papibe View Post
    Try this:
    Code:
    sudo ifconfig eth0 up
    and then again:
    Code:
    sudo service networking-manager restart
    Tell us how it goes.
    Regards.
    It still doesn't work.

  8. #8
    Join Date
    Feb 2009
    Location
    Dallas, TX
    Beans
    6,358
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: DNS lookup fails all of a sudden (Precise Pangolin)

    Did any of the other settings change?

    Could you post the result of these commands?
    Code:
    ifconfig
    
    route -n
    
    cat /etc/resolv.conf
    
    cat /var/run/nm-dns-dnsmasq.conf
    Regards.

  9. #9
    Join Date
    May 2012
    Beans
    8

    Re: DNS lookup fails all of a sudden (Precise Pangolin)

    Quote Originally Posted by papibe View Post
    Did any of the other settings change?

    Could you post the result of these commands?
    Code:
    ifconfig
    
    route -n
    
    cat /etc/resolv.conf
    
    cat /var/run/nm-dns-dnsmasq.conf
    Regards.
    Code:
    ifconfig
    eth0 Link encap:Ethernet HWaddr 78:e7:d1:ca:3d:ae
    inet addr:68.199.112.124 Bcast:68.199.115.255 Mask:255.255.252.0
    inet6 addr: fe80::7ae7:d1ff:feca:3dae/64 Scope:Link
    UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
    RX packets:3877 errors:0 dropped:0 overruns:0 frame:0
    TX packets:909 errors:0 dropped:0 overruns:0 carrier:0
    collisions:0 txqueuelen:1000
    RX bytes:236004 (236.0 KB) TX bytes:116119 (116.1 KB)
    Interrupt:42 Base address:0x6000

    lo Link encap:Local Loopback
    inet addr:127.0.0.1 Mask:255.0.0.0
    inet6 addr: ::1/128 Scope:Host
    UP LOOPBACK RUNNING MTU:16436 Metric:1
    RX packets:1950 errors:0 dropped:0 overruns:0 frame:0
    TX packets:1950 errors:0 dropped:0 overruns:0 carrier:0
    collisions:0 txqueuelen:0
    RX bytes:127601 (127.6 KB) TX bytes:127601 (127.6 KB)
    Code:
    route -n
    Kernel IP routing table
    Destination Gateway Genmask Flags Metric Ref Use Iface
    0.0.0.0 68.199.112.1 0.0.0.0 UG 0 0 0 eth0
    68.199.112.0 0.0.0.0 255.255.252.0 U 1 0 0 eth0
    169.254.0.0 0.0.0.0 255.255.0.0 U 1000 0 0 eth0
    Code:
     cat /etc/resolv.conf
    # Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
    # DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
    nameserver 127.0.0.1
    Code:
    cat /var/run/nm-dns-dnsmasq.conf
    server=167.206.245.129
    server=167.206.245.130

  10. #10
    Join Date
    Feb 2009
    Location
    Dallas, TX
    Beans
    6,358
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: DNS lookup fails all of a sudden (Precise Pangolin)

    Looks OK.

    Could you test some addresses?
    Code:
    nslookup ubuntu.com
    
    dig yahoo.com
    Regards.

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