>needs to use the Internet.  How would I go about allowing packets
>to/from a specific private IP address faster throughput with
>IPCHAINS?  Thank you for any advice!

Take a look here:
http://www.linuxdoc.org/HOWTO/IPCHAINS-HOWTO-4.html#ss4.1

You'll want to read the whole thing, but skip down the page to 
"Manipulating the Type Of Service". That sounds a lot like what you 
want to do.