"Phantom" network interface

[AlanRaczek]

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.

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.

Lost.



...Alan

 

[wizardfromoz]

Lost.

Ouch

Hi Alan and welcome to linux.org

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

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 ), 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.

Cheers

Chris Turner
wizardfromoz - that's DownUnder

 

[nuna]

Now I have 3 interfaces: Auto_eth3, lo, rename3.
If I look in /etc/sysconfig/network-scripts I see ifconfig-auto_eth3, ifconfig-auto-eth4, ifcfg-lo . I do not see rename3.

Red Hat Deployment Guide can help:

NetworkManager connections are always either user connections or system connections.
User connections are so-called because they are specific to the user who creates them. In contrast to system connections, whose configurations are stored under the /etc/sysconfig/network-scripts/ directory (mainly in ifcfg-<network_type> interface configuration files), user connection settings are stored in the GConf configuration database and the GNOME keyring, and are only available during login sessions for the user who created them.
NetworkManager can quickly and conveniently convert user to system connections and vice versa.

Network Interfaces ...

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.