Re: How to create a simple tap0 interface using nmcli

[Dan Williams <dcbw redhat com>]

On Mon, 2016-01-25 at 12:21 +0000, Vincent Fortier wrote:
> Thnx.  So lets say I previously created a bridge interface and linked
> in my
> eth0:
> $ nmcli connection show
> $ nmcli connection delete <eth0|eth0-UUID>
> $ nmcli connection add type bridge \
>          ifname br0 con-name br0
> $ nmcli connection add type bridge-slave \
>          ifname eth0 con-name eth0 master br0
>
> Presumably I create tap0 then add it to my br0 such as the following:
>
> $ nmcli connection add type tun \
>
>           ifname tap0 con-name tap0 \
>
>           mode tap owner `id -u` ip4 0.0.0.0/24
> $ nmcli connection add type bridge-slave \
>           ifname tap0 con-name tap0 master br0

Here you're creating two separate network profiles.  You only need to
create one profile for tap0 that includes the bridge-slave bits:

$ nmcli connection add type tun \
         ifname tap0 con-name tap0 \
         slave-type bridge master br0 \
         mode tap owner `id -u` ip4 0.0.0.0/24

or:

$ nmcli connection add type tun \
          ifname tap0 con-name tap0 \
          mode tap owner `id -u` ip4 0.0.0.0/24
$ nmcli connection mod tap0 connection.slave-type bridge \
          connection.master br0

'nmcli con add type <*-slave>' is just a short-cut to fill slave-type
for you.  The major point is that whenever you use "nmcli con add" it
will create a *new* connection profile.  You want to either put all
properties in one 'nmcli con add' or you can use 'nmcli con mod' to set
them after creation.

Dan

> Then I would be good to go with qemu and be all-set "automagically"
> at
> every reboot as autoconnect=yes is set by default.
>
> NM1.2 not yet available under Ubuntu 16.04 alpha (duno if planned to
> be
> included?) so can't test it unless I recompile from source. 
>  Therefore in
> the meantime it's more of a personnal knowledge thing than anything
> else.
>
> Thnx in advance!
>
> - vin
>
> Le lun. 25 janv. 2016 à 03:22, Beniamino Galvani <bgalvani redhat com
> > a
> écrit :
>
> > On Mon, Jan 25, 2016 at 02:46:54AM +0000, Vincent Fortier wrote:
> > > I was wondering how can I create a tap interface using nmcli? 
> > >  Search
> > again
> > > and again witouth luck...
> >
> > Hi,
> >
> > creation of tun/tap devices is supported only in NetworkManager
> > 1.2.
> > On such version you can create a tap connection using the command:
> >
> >  $ nmcli connection add type tun ifname tap0 con-name mytap0 \
> >                         mode tap owner `id -u` ip4 x.x.x.x/24
> >
> > The connection will have autoconnect=yes by default and so the
> > device
> > will be created automatically every time NM starts. You can
> > manually
> > enable or disable the connection with:
> >
> >  $ nmcli connection up mytap0
> >  $ nmcli connection down mytap0
> >
> > Beniamino
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