network drops out on FC27
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  1. #1
    Join Date
    May 2010
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    network drops out on FC27

    After upgrading my laptop to FC27 the network (eno1) drops out intermittently.

    To get it to work again I pull the ethernet cable out and then plug it back in. This usually "fixes" it.

    Is there a way to fix this permanently, or is there a command to "restart" the network so I don't have to keep unplugging the cable?

  2. #2
    Join Date
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    Re: network drops out on FC27

    This should not happen. Do you have a bad cable maybe ? or a bad connector ?

    open a terminal, and as root , execute: mii-tool eno1
    and post the output here.

    Then keep the terminal open, and type: mii-tool eno1 -w

    and just leave it sitting there, until your connection drops, then post that output.
    "monsters John ... monsters from the ID..."
    "ma vule teva maar gul nol naya"

  3. #3
    Join Date
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    Australia
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    Re: network drops out on FC27

    Quote Originally Posted by jeffreysj
    After upgrading my laptop to FC27 the network (eno1) drops out intermittently.

    To get it to work again I pull the ethernet cable out and then plug it back in. This usually "fixes" it.

    Is there a way to fix this permanently, or is there a command to "restart" the network so I don't have to keep unplugging the cable?
    There is the choice of using NetworkManager or network to run the network. There's some info at the following thread which may be of interest:
    https://forums.fedoraforum.org/showt...ume-from-sleep
    There is a restart command which is something like:
    Code:
    systemctl restart network
    or if using NetworkManager, use that term. I found it doesn't always work though. However, if it's just the ethernet, you could try something like:
    Code:
    ip link set eth0 up
    but find out what your ethernet device is named, which you can do by running:
    Code:
    ifconfig
    or
    Code:
    ip addr
    Starting the ethernet might be sufficient. If the intermittency continues, you could write a script to check whether the ethernet is up, and if not, start it up with an ip link command such as the above. Intermittent problems can be the most difficult to suss out and may be hardware of software related.

  4. #4
    Join Date
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    Re: network drops out on FC27

    Lease issue maybe? (Although I don't know why it would start all of a sudden).
    ???
    Change - the only constant.

  5. #5
    Join Date
    May 2010
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    6
    Linux Chrome 67.0.3396.62

    Re: network drops out on FC27

    Hi,

    The output is
    > mii-tool eno1
    eno1: negotiated 1000baseT-FD flow-control, link ok

    The output from the monitoring (over about 18 hours) is:
    > mii-tool eno1 -w
    18:44:31 eno1: negotiated 1000baseT-FD flow-control, link ok
    18:50:28 eno1: no link
    18:50:41 eno1: negotiated 1000baseT-FD flow-control, link ok
    07:04:55 eno1: no link
    07:05:02 eno1: negotiated 1000baseT-FD flow-control, link ok
    11:16:51 eno1: no link
    11:16:57 eno1: negotiated 1000baseT-FD flow-control, link ok

    Does that provide any useful info?

  6. #6
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    Linux (Fedora) Firefox 60.0

    Re: network drops out on FC27

    bad cable I reckon, or bad port on the switch, maybe it drops when you are doing jumbo-frames, which would indicate bad switch.
    "monsters John ... monsters from the ID..."
    "ma vule teva maar gul nol naya"

  7. #7
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    Linux Firefox 52.0

    Re: network drops out on FC27

    K - having experienced whacky network stuff once, I have to ask - any chance you have more than one DHCP server on your network?

    I mention this because (lacking another switch), I used the 'back-end' of a router as a switch but forgot to turn off the DHCP on it - resulting in dual address servers. Most of the time everything was predictable. Then came those intermittent times where machines 'disappeared' because they got new addresses for 'some period' ...
    If static address - are you 'colliding' with an already assigned address (DHCP or static) ?

    - thinking out loud; likely wrong.
    Change - the only constant.

  8. #8
    Join Date
    Sep 2009
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    Linux (Fedora) Firefox 60.0

    Re: network drops out on FC27

    Hi,
    I am using a plugable USB Ethernet adapter - v2.0.

    I get this - the notification reports that the connection is activated or not when using the Laptop, and i can see the LED's go out when the connection is deactivated.

    I worked out what is causing the issue - it is systemd-journal.

    I run the top command in a terminal - and when i see the link drop - every time, systemd-journal is running.

    Can you check to see if this is occurring on yours - has only started to happen in the past 2 to 3 months.

    Regards,
    Shadders.

    P.S. Has happened 2x whilst writing this post - systemd-journal is the cause.
    Last edited by shadders; 21st June 2018 at 10:10 PM.

  9. #9
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    Re: network drops out on FC27

    maybe systemd-journal is running cuz it's trying to report an error.

    what does journalctl -xe say ?
    "monsters John ... monsters from the ID..."
    "ma vule teva maar gul nol naya"

  10. #10
    Join Date
    Sep 2009
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    Linux (Fedora) Firefox 60.0

    Re: network drops out on FC27

    Hi,
    Thanks for the advice - can see many entries as follows :
    Code:
    Jun 21 22:06:11 localhost.localdomain kernel: asix 1-1.2:1.0 (unnamed net_device) (uninitialized): Failed to read reg index 0x0000: -71
    Jun 21 22:06:11 localhost.localdomain kernel: asix 1-1.2:1.0 (unnamed net_device) (uninitialized): Failed to write reg index 0x0000: -71
    Jun 21 22:06:11 localhost.localdomain kernel: asix 1-1.2:1.0 (unnamed net_device) (uninitialized): Failed to enable software MII access
    I have for the past 1 year 3 months used the plugable USB ethernet adapter with no issues apart for the past 2 to 3 months.

    So, do i need to set up an initialisation file, or config file ?

    Thanks and regards,
    Shadders.

  11. #11
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    Linux (Fedora) Firefox 60.0

    Re: network drops out on FC27

    Quote Originally Posted by shadders
    Hi,
    Thanks for the advice - can see many entries as follows :
    Code:
    Jun 21 22:06:11 localhost.localdomain kernel: asix 1-1.2:1.0 (unnamed net_device) (uninitialized): Failed to read reg index 0x0000: -71
    Jun 21 22:06:11 localhost.localdomain kernel: asix 1-1.2:1.0 (unnamed net_device) (uninitialized): Failed to write reg index 0x0000: -71
    Jun 21 22:06:11 localhost.localdomain kernel: asix 1-1.2:1.0 (unnamed net_device) (uninitialized): Failed to enable software MII access
    I have for the past 1 year 3 months used the plugable USB ethernet adapter with no issues apart for the past 2 to 3 months.

    So, do i need to set up an initialisation file, or config file ?

    Thanks and regards,
    Shadders.
    " plugable USB ethernet adapter "

    hmm, I have seen during the last year of linux kernel updates, USB stuff starting to act odd, as if they are trying to "clean up" the foncusion between the EHCI, OHCI, AHCI, UHCI,..... etc etc (ad infinitum)..... (i.e. USB 1.1, 2.0, 3.0 ........ 5000.0, .... 12000.0....)

    Can you try and plug the USB Ethernet dongle into a different port ? i.e. not the blue one but the black one, or viceversa ?
    "monsters John ... monsters from the ID..."
    "ma vule teva maar gul nol naya"

  12. #12
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    Linux (Fedora) Firefox 60.0

    Re: network drops out on FC27

    Hi,
    I will try later- since it is a laptop, will try the port on the other side which i think is USB3.0, where as i am using USB2.0 for mouse and ethernet adapter.
    Regards,
    Shadders.

  13. #13
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    Linux (Fedora) Firefox 60.0

    Re: network drops out on FC27

    Hi bobx001,
    I checked the manual - i have been using USB3.0 port all the time, and tried a USB2.0 port and a few moments ago had the issue twice. Same error messages as before in journalctl.

    As such it seems to be a USB2.0 and USB3.0 issues. I have a USB3.0 ethernet adapter - will try that at some stage.

    Regards,
    Shadders.

  14. #14
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    Re: network drops out on FC27

    so, your laptop does not have a proper Ethernet RJ45 jack ? or it's broken ?
    "monsters John ... monsters from the ID..."
    "ma vule teva maar gul nol naya"

  15. #15
    Join Date
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    Linux (Fedora) Firefox 60.0

    Re: network drops out on FC27

    Hi bobx001,
    Yes the ethernet adapter (plug) is broken. Annoyed with Dell - a laptop is portable, so you will be plugging in connectors a lot, so robustness is a key requirement- sadly Dell fail here.

    The USB plugable ethernet has been working for 1 year 3 months, and this has only been happening for the past 2 to 3 months. I will try the USB3.0 adapter i have to see if this makes a difference.

    Regards,
    Shadders.

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