iptables and Realaudio

[Jeremy]

Hello all,

 I know this has probably been asked before, but i
couldn't find anything related in the archive. I am
trying to allow only certain people access to use
realplayer. If I SNAT the internal addresses then
things work just fine. The problem is I don't want
them to have full access to the internet, I only want
the SNAT to work for Realaudio. I've tried various
combinations of forward and snat rules but i can't
seem to get it to work.
 The document i have from real.com states that the
only ports i need to mess with are 554 and 7070 TCP.
Also udp ports 6970 through 7170 need to be open for
incoming traffic only. Through testing it seems that
my incoming ESTABLISHED,RELATED rule takes care of
those incoming udp ports.
  Any help you guys and gals can offer would be
appreciated.

Thanks,
   Jeremy

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