ProxyRequests On
ProxyVia On

<Proxy *>
   Order deny,allow
   Deny from all
   Allow from 192.168.42.0/24 127.0.0.0/255.0.0.0 ::1/128

   RewriteEngine On
   RewriteRule ^http://.*archive\.ubuntu\.com/(.*)$ http://localhost:9999/$1 [P]
   RewriteRule ^http://security\.ubuntu\.com/(.*)$ http://localhost:9999/$1 [P]
</Proxy>