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Thread: Second network interface is preventing first from operating correctly 18.04

  1. #1
    Join Date
    Dec 2017
    Beans
    3

    Unhappy Second network interface is preventing first from operating correctly 18.04

    Running Ubuntu 18.04.5 server on Virtualbox 6.1.14
    Problem persists regardless of if I'm using netplan or interfaces

    On boot:
    - Second interface works fine
    - First interface can only be pinged over it's leased address
    -
    Code:
    ifdown enp0s8;ifdown enp0s3
    followed by
    Code:
    ifup enp0s3
    brings up my internet but if I
    Code:
    ifup enp0s8
    after bringing up enp0s3 it breaks enp0s3 and enp0s8 can't be brought up and down anymore without generating RTNETLINK answers: file exists


    Code:
    # interfaces(5) file used by ifup(8) and ifdown(8)
    # Include files from /etc/network/interfaces.d:
    
    source /etc/network/interfaces.d/*
    
    # The loopback network interface
    auto lo
    iface lo inet loopback
    
    # The primary network interface
    allow-hotplug enp0s3
    iface enp0s3 inet dhcp
    
    # The internal network interface
    allow-hotplug enp0s8
    iface enp0s8 inet static
            address 192.168.56.105
            netmask 255.255.255.0
            gateway 192.168.56.1
    I generally use auto device but I was playing with different settings.

    This problem doesn't exist on Debian 10.6.0. I was able to get my two network interfaces working perfectly with no issues using these interface settings so this brings me to my last question; Is there a way to modify Ubuntu 18.04.5 or the newest to switch back to the network package & configurations of it's Debian parent?

    Suggestion: Option for using the default package(s)/configuration of the Debian distro 18.04.5 and 20.04 are based off of.

  2. #2
    Join Date
    Mar 2010
    Location
    Squidbilly-Land
    Beans
    21,623
    Distro
    Ubuntu Mate 16.04 Xenial Xerus

    Re: Second network interface is preventing first from operating correctly 18.04

    Wasn't ifupdown deprecated in 17.10 and later? Use netplan. Post your netplan file please.

  3. #3
    Join Date
    Dec 2017
    Beans
    3

    Re: Second network interface is preventing first from operating correctly 18.04

    disabled. Tried netplan and it has same problem. Debian was working. booted it again after post and it stopped working. I was running my servers with zero issues on Ubuntu so the problem is Windows. Also did you read what I wrote? Is it not obvious that i disabled netplan to use interfaces? just because its deprecated doesn't mean I'm suddenly not allowed to use it.
    Last edited by raptorlinux; 4 Weeks Ago at 07:43 AM.

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