Re: Changing IP on bridge without disconnecting VMs

[Thomas Haller <thaller redhat com>]

On Wed, 2022-07-13 at 08:49 -0500, Dan Williams via networkmanager-list
wrote:
> On Wed, 2022-07-13 at 07:57 -0500, Chris Adams via networkmanager-
> list
> wrote:
> > I have my primary ethernet interface configured in a bridge in NM,
> > so
> > that I can run VMs and have them on the local network directly.  I
> > needed to change the IP of the host system, but when I ran "nmcli
> > con
> > up
> > br0", NM removed the VM virtual NICs from the bridge.
> >
> > Is there a way to do this differently so that wouldn't happen? 
> > It's
> > not
> > a common thing of course, but something I have needed to do before.
>
> I think this two step process might work for you:
>
> 1) update the connection to remove the old IP and add the new one,
> with
> something like:
>
> nmcli con <name> mod +ipv4.addresses <new IP>
> nmcli con <name> mod -ipv4.addresses <old IP>
>
> 2) nmcli dev reapply <bridge interface name>


What Dan says is correct.

Just to add, there is also `nmcli device modify "$IFNAME"
ipv4.addresses <new IP>`, which does something similar, but without
modifying the persistent profile. An that case, the change is
ephemeral.


Thomas