Network namespaces are amazingly powerful but every guide I can find seems to include a whole bunch of manual IP address management (either through virtual ethernet pairs or through VPNs). The guides also seem to skip over IPv6 in many cases, which is another downside I've noticed.

Is there a tool out there to manage these namespaces automatically? I'd like to isolate applications from each other or put them in groups together, but I really don't want to deal with writing scripts for every single application.