[CentOS] Network configuration: desktop vs. laptop

Sun Apr 9 08:29:24 UTC 2017
Nux! <nux at li.nux.ro>

Hi Niki,

On CentOS it's normal for both wireless and wired to be connected at the same time, maybe what you are seeing is just the icon's being confusing or not being replaced with the right thing?

This is easy to check, just issue an "ip route". On My system I can see something like this:

default via dev eth0  proto static dev eth0  proto kernel  scope link  src  metric 1 dev wlan0  proto kernel  scope link  src  metric 2

Routing will prefer eth0 (wired), with the smaller metric, giving you the better performance.

I found this quite handy a couple of times, say you remove the laptop from the desk and go in the garden or something, you won't lose your connections.

Sent from the Delta quadrant using Borg technology!


----- Original Message -----
> From: "info" <info at microlinux.fr>
> To: "CentOS mailing list" <centos at centos.org>
> Sent: Saturday, 8 April, 2017 21:57:18
> Subject: [CentOS] Network configuration: desktop vs. laptop

> Hi,
> I'm just migrating some stuff from Slackware Linux to CentOS, and I have
> a question about the orthodox way of configuring a network connection.
> On a desktop or workstation, I usually get rid of NetworkManager:
>  # systemctl stop NetworkManager
>  # yum remove NetworkManager
> Then I edit the /etc/sysconfig/network-scripts/ifcfg-XXXXX file
> corresponding to my network interface. Here's a working example:
>  # /etc/sysconfig/network-scripts/ifcfg-enp2s0
>  DEVICE=enp2s0
>  TYPE=Ethernet
>  ONBOOT=yes
> Now I wonder how I should configure things on a laptop, where I usually
> keep NetworkManager. On a Slackware system, it's usually just a matter
> of leaving a pristine /etc/rc.d/rc.inet1.conf file, and then activate
> /etc/rc.d/rc.networkmanager. Starting from there, when there's a
> wireless connection available, I can connect using the little
> NetworkManager applet on the desktop. And when I switch to cable,
> NetworkManager will prefer that connection automagically.
> On a default installation (I went for the KDE version), NetworkManager
> is active, so I'll keep that. 'ifconfig' shows me that the cabled
> connection is up and running via enp3s0 on the laptop. Wireless doesn't
> seem to work, but 'ifconfig -a' shows me a wlp2s0 interface, which means
> there's a chance it will work.
> First thing I did was edit ifcfg-enp3s0 like this:
>  DEVICE="enp3s0"
>  TYPE="Ethernet"
> Then I edited ifcfg-wlp2s0 from scratch, since there's nothing present:
>  DEVICE="wlp2s0"
>  TYPE="Wireless"
> I rebooted (just to be on the safe side), and I have a partial success.
> I can connect via KDE's NetworkManager applet. But when I plug in an
> Ethernet cable, the wireless connection stays up and is not replaced by
> the cabled connection.
> Any suggestions?
> Niki Kovacs
> --
> Microlinux - Solutions informatiques durables
> 7, place de l'église - 30730 Montpezat
> Web  : http://www.microlinux.fr
> Mail : info at microlinux.fr
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