Re-direct Http Traffic To Specific Ip Addresses

Does anyone know how i can re-direct http traffic to certian ip addresses based on the header.

For instance, if i have my main website (www.site1.test.com) running on my apache server @ 192.168.128.1.
Then i have another web site (www.site2.test.com) running on an embedded device @ 192.168.128.10.

Is there a way to look at the headers and forward the requests to the appropiate web server?

Before we changed over to linux i used to run ISA2004 which would allow me to redirect traffic based on the header.
I have tried google and have not really found anything that will seem to do the trick.

Thanks Steve.

You need an application level proxy to do that. Apache can do this in proxy forward mode. You can't do it at the packet level (firewall) because it would involve too much inspection of the TCP stream.

Look at the docs for mod_proxy at httpd.apache.org, and also Google for tutes.

Ken_yap gave good advice, but just to eliminate the possibility, you can't sort that with nameservers, you really need header based redirection?