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"Phantom" network interface

Discussion in 'General Linux' started by AlanRaczek, Aug 10, 2018.

  1. AlanRaczek

    AlanRaczek New Member

    Aug 10, 2018
    Likes Received:
    Hi all,
    I will start by saying I am a Windows admin, been for 20 years. So my Linux experience is limited to ESX server. I have an issue with the network interfaces in Red Hat EL 6.7. I was messing with network interfaces in RH and I was using the Network Connections application and I had renamed an interface (so I thought). Now I have 3 interfaces: Auto_eth3, lo, rename3. If I do an ifconfig I see these three interfaces.

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    If I look in /etc/sysconfig/network-scripts I see ifconfig-auto_eth3, ifconfig-auto-eth4, ifcfg-lo . I do not see rename3. This is driving me nuts.Essentially I really want rename3 to be auto_eth3 as that MAC address is a configured NIC on the VM. If I ping the IP on Auto_eth3 (as shown in the ifcfg-auto_eth3) "network is unreachable" error. Any idea's what happened? How do you REALLY configure NIC's in linux? Network manager?

    If I "find" or "grep" i cannot find rename3 anywhere.

    Hard to get screen shots over as this is a disconnected system.


  2. wizardfromoz

    wizardfromoz Super Moderator
    Staff Member Gold Supporter

    Apr 30, 2017
    Likes Received:
    Ouch :(

    Hi Alan and welcome to linux.org :D

    Disclaimer is that what I know about Networking in general, and RHEL specifically you could write on the back of a small postal stamp and have room to transcribe the entire contents of the King James Bible. My expertise (stop laughing people) lies in other areas.

    But we have other people here who are Sysdamins &c, work in CentOS and other areas, so this is just a holding Post and "The Cavalry" will likely be along soon :p

    As a starting point - Does RHEL have an /etc/udev/rules.d/ and if so, what are its contents?

    After the dust settles here (hopefully with success :D), you may want to consider installing Timeshift, see my Tute here https://www.linux.org/threads/timeshift-similar-solutions-safeguard-recover-your-linux.15241/

    Its maker, Tony George, I believe has yet to crack installing it on OpenSUSE, but I have installed it successfully on Fedora, Korora, Mageia and OpenMandriva, amongst the RPM-based Distros. It is a little like Windows Restore, but IMO considerably better.

    With Timeshift, you can take snapshots on demand, and roll back if your system heads south for the winter.

    Good luck, hope you get help soon, and I'll watch and see what I can learn.


    Chris Turner
    wizardfromoz - that's DownUnder
    atanere likes this.
  3. nuna

    nuna Member

    Aug 29, 2017
    Likes Received:
    Red Hat Deployment Guide can help:
    So it's possible it's a user connection:
    # network connections
    nmcli con list
    #network devices
    nmcli dev list |grep DEVICE

    About ping to eth3 unreachable, from where is the ping executed? If it's from the Host Machine maybe the VM Guest network interface has to be set to bridged.
    #3 nuna, Aug 14, 2018
    Last edited: Aug 14, 2018
    wizardfromoz, atanere and Condobloke like this.

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