[pve-devel] [PATCH container] net: do not force network interface down if `link_down` is to 0

[Fabian Grünbichler]

On April 30, 2025 1:19 pm, Christoph Heiss wrote:
> Reported in the forum [0].
> 
> Currently, the (host) interface is always forced down if the property is
> set. Check the actual (boolean) value and honor the users request if set
> to `0` aka. off.
> 
> [0] https://forum.proxmox.com/threads/bug-container-network-card-turned-off.160691/
> 
> Fixes: 9e56948 ("net: Add `link_down` config to allow setting interfaces as disconnected")
> Signed-off-by: Christoph Heiss <c.heiss at proxmox.com>
> ---
>  src/PVE/LXC.pm | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/src/PVE/LXC.pm b/src/PVE/LXC.pm
> index a58c997..5d9b524 100644
> --- a/src/PVE/LXC.pm
> +++ b/src/PVE/LXC.pm
> @@ -995,7 +995,7 @@ sub vm_stop_cleanup {
>  sub net_tap_plug : prototype($$) {
>      my ($iface, $net) = @_;
>  
> -    if (defined($net->{link_down})) {
> +    if (defined($net->{link_down}) && $net->{link_down}) {

the defined here seems kinda strange and misleading, shouldn't we just
check whether it is *true*?

>  	PVE::Tools::run_command(['/sbin/ip', 'link', 'set', 'dev', $iface, 'down']);
>  	# Don't add disconnected interfaces to the bridge, otherwise e.g. applying any network
>  	# change (e.g. `ifreload -a`) could (re-)activate it unintentionally.
> -- 
> 2.49.0
> 
> 
> 
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