Comment 2 for bug 1376958

The gateway charm is the only one which makes use of namespaces so the scope makes sense to me; I'm assuming that this will require a reboot to take effect? If that is the case then we can configure this for now in the charm, but we can't effectively apply this change without causing hook execution.

I'd recommend as a workaround for now applying this globally across all deployed servers by using MAAS to provide additional kernel parameters.