Why is it obvious that you don't have reverse DNS for the external
interface?
Because most ADSL lines (certainly in the UK) are provided without a
way for you to set up the reverse DNS, and the size of company that
would have one server doing NAT, email, web, etc. doesn't have a
particularly expensive connection. This isn't a leased line here :-)
Normally OS X gets really cranky if it does not have forward and
reverse lookups on the external interface.
I know it gets cranky without reverse lookups, hence the question. I
just want it to completely ignore that interface as the internal DNS
is fine.
