Consider more extensive docs page on iptables

[deontologician]

Got this comment in a recent HN thread:

+1 to using RethinkDB! I'm also using RethinkDB in production, and I love it! The only issue is that you have to set up persistent filters via iptables in addition to having an authKey. They do have a guide[0] for that, however they do not provide any instructions for ensuring that the filters on iptables stay up, or how to restore them if they are temporarily wiped out :/

[0] http://rethinkdb.com/docs/security/

[danielmewes]

:+1:

In fact we don't even seem to mention that the iptables configuration is only temporary and has to be applied at each boot before RethinkDB is started.