Password protect OR allow from IP

I am trying to set up a server that can allow a certain IP (actually
the server's IP) to download content without logging in while allowing
all others to access the content after logging in. I would like to do
this all in one directory. So, i'd like apache to first check the IP,
if the IP is self, then allow. Otherwise, the second option would be
to authenticate. Is this possible? I can get each to work in separate
directories but am having no luck using the same directory.

THANKS!

I'd also like to note that i'm using apache 2 and i've tried various
combinations, such as:
<Directory /blah>
order deny,allow
deny from all
allow from <exact ip address>
<Basic authentication scheme>
require user <user>
satisfy any

i get either the server open to all (no pw or ip restriciton) or just
pw restriction. the ip check does not seem to be working. i've also
tried it as order allow,deny and tried other people's scripts from this
forum, to no avail.

what's up with this?