That is a horrible glib answer.
I was supposed to get a EASY TO USE, READY TO GO, Mesos development environment. So now I have to ssh to 5 boxes and manually add iptables rules? Why don't I just install Mesos myself then?
Honestly this whole thing just reads to me as a marketing releases, not something I would recommend anyone to use.
If the answer is 'use' iptables, fine, but then I would expect the automation that builds my cluster to do it for me, not leave me with a $200 a month cluster just waiting to get hacked.