[ale] CentOS 7 virtual IF installed by default

[Ted W.]

What you're describing sounds like the default IP range configured by
libvirt. To see the networks configured run the following as root:

  `virsh net-list`
  
If you see a network in that list named "default",
check what it's dhcp range is configured as by running

  `virsh net-edit default`

You'll see two lines with conflicting IP information in them. The first
will be "<ip address='192.168.xxx.x' netmask=255.255.255.0'> and the
second will be "<range start ='192.168.xxx.x' end='192.168.xxx.x'/>. If that
range conflicts with your home network's range, change the third octet
to a different value, save the file and quit (vim: <esc>, :wq). If
"default" does not conflict with your network and there are others
listed, try one of them instead. Then recreate the interface using the new
information with:

  `virsh net-destroy default`
  `virsh net-start default`

(replace "default" with whatever network you edit if "default" is not
the culprit)

Cheers,
Ted

On Mon, Sep 05, 2016 at 05:54:29PM -0400, Edward O. Holcroft wrote:
> Hi all,
> 
> I'm trying to get a better understanding of why CentOS installs a virtual
> interface on 192.168.122.1 seemingly by default.
> 
> I'm finding it's creating trouble on my network because AD DNS is picking
> up this IP on the network and adding an entry for it. I tried deleting it
> (the DNS entry) but it keeps getting recreated. I could disable the
> interface, but am concerned I might break something. What's it actually for
> and is it safe to just get rid of it?
> 
> The strange thing is my network seems to prefer finding this virtual
> interface's IP over the IP that I assigned to etho. I certainly don't want
> that.
> 
> I'm running CentOS for Windows file sharing. Maybe I installed some package
> that results in this virtual interface being installed, but I'm not sure
> what. These boxes are really only doing Samba, although they do have a
> basic GUI installed too.
> 
> ed
> 
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