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Thread: Hardy loses network connection

  1. #1
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    Ubuntu 10.10 Maverick Meerkat

    Hardy loses network connection

    Does anyone seem to have this problem?

    I updated from Gutsy to Hardy this weekend on my Acer Aspire 3680-2633 laptop. The actual installation went like clockwork and everything seemed to work after Hardy rebooted. Just a few days ago I started seeing a strange behavior by the machine. It would lose its network connection. Apps like Firefox could not make a connection and would time out. Evolution would do the same. In looking at my network settings via Gnome, everything looked normal. Only a reboot seemed to restore the network connection. After some digging around using the terminal, I finally got the network back up again using this command:

    sudo /sbin/ifup eth0

    The most peculiar thing about this is this only happens on my wired ethernet connection. The wireless connection works fine.

    I'm not sure if this is just a Hardy bug or if this is a result of doing an update as opposed to doing a clean install of Hardy.

    Anyone experience this?

  2. #2
    Join Date
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    Ubuntu Development Release

    Re: Hardy loses network connection

    When the network goes down again, post the results of:

    Code:
    ifconfig
    cat /etc/network/interfaces
    Hopefully that will show a little diagnostic information.

  3. #3
    Join Date
    Apr 2008
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    Re: Hardy loses network connection

    I had the same problem! After the install, I set up my static IP address, geteway and dns servers. I can browse and install updates. Then I reboot and all is lost! The settings remain, but there is not connectivity. Doing sudo /sudo /sbin/ifup eth0 brings it back to life.

    I'll have to remember to do an ifconfig and post it here.

  4. #4
    Join Date
    Jun 2005
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    9

    Re: Hardy loses network connection

    I'm also having a similar networking issue that started after Hardy went gold. However, I've tracked it down to an what seems to be an errant Pulseaudio process that is sending so much data that networking is unusable. Check system monitor to see if a large amount of data is being sent.

  5. #5
    Join Date
    Jun 2006
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    Christchurch, New Zealand
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    39
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    Ubuntu 8.10 Intrepid Ibex

    Re: Hardy loses network connection

    I keep lossing my DNS settings each reboot interesting enough
    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 10.1.1.1
    I'll have a look through the man pages see what I can find

  6. #6
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    Re: Hardy loses network connection

    OK, it happened again. Here's what I got doing the ifconfig:

    syee@Wanderer:~$ ifconfig
    eth0 Link encap:Ethernet HWaddr 00:16:36:fa:af:c4
    inet addr:75.95.225.133 Bcast:75.95.255.255 Mask:255.255.192.0
    inet6 addr: fe80::216:36ff:fefa:afc4/64 Scope:Link
    UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
    RX packets:7492 errors:0 dropped:0 overruns:0 frame:0
    TX packets:910 errors:0 dropped:0 overruns:0 carrier:0
    collisions:0 txqueuelen:1000
    RX bytes:2350277 (2.2 MB) TX bytes:98156 (95.8 KB)
    Interrupt:16

    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:1727 errors:0 dropped:0 overruns:0 frame:0
    TX packets:1727 errors:0 dropped:0 overruns:0 carrier:0
    collisions:0 txqueuelen:0
    RX bytes:74495 (72.7 KB) TX bytes:74495 (72.7 KB)

    syee@Wanderer:~$ cat /etc/network/interfaces
    auto lo
    iface lo inet loopback


    iface eth0 inet dhcp





    auto eth0
    syee@Wanderer:~$



    I'm relatively new to Linux and Ubuntu and don't really know what some of this means.

  7. #7
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    Re: Hardy loses network connection

    bump

  8. #8
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    Re: Hardy loses network connection

    The only thing I can think of is maybe it's because of my update from Gutsy to Hardy. I'm wondering if I should just do a clean install and see if that helps it. My wireless is working flawlessly.

  9. #9
    Join Date
    Apr 2008
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    3

    Re: Hardy loses network connection

    Ok, so this is what ifconfig gives before ifup:

    eth0 Link encap:Ethernet HWaddr 00:50:8d:f5:03:3f
    inet6 addr: fe80::250:8dff:fef5:33f/64 Scope:Link
    UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
    RX packets:680 errors:0 dropped:0 overruns:0 frame:0
    TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
    collisions:0 txqueuelen:1000
    RX bytes:91662 (89.5 KB) TX bytes:468 (468.0 B)
    Interrupt:16 Base address:0xa000

    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:1390 errors:0 dropped:0 overruns:0 frame:0
    TX packets:1390 errors:0 dropped:0 overruns:0 carrier:0
    collisions:0 txqueuelen:0
    RX bytes:69500 (67.8 KB) TX bytes:69500 (67.8 KB)

    after ifup:
    eth0 Link encap:Ethernet HWaddr 00:50:8d:f5:03:3f
    inet addr:192.168.1.2 Bcast:192.168.1.255 Mask:255.255.255.0
    inet6 addr: fe80::250:8dff:fef5:33f/64 Scope:Link
    UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
    RX packets:2840 errors:0 dropped:0 overruns:0 frame:0
    TX packets:867 errors:0 dropped:0 overruns:0 carrier:0
    collisions:0 txqueuelen:1000
    RX bytes:1104424 (1.0 MB) TX bytes:103131 (100.7 KB)
    Interrupt:16 Base address:0xa000

    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:1390 errors:0 dropped:0 overruns:0 frame:0
    TX packets:1390 errors:0 dropped:0 overruns:0 carrier:0
    collisions:0 txqueuelen:0
    RX bytes:69500 (67.8 KB) TX bytes:69500 (67.8 KB)

    Each reboot ruins the config. I suppose the workaround will be to put /sbin/ifup eth0 in a startup script? init.d?

  10. #10
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    Re: Hardy loses network connection

    Help.

    Does anyone know what's going on here?

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