Configuring ipfw with squid as a transparent proxy

[Diego Camarena González]

Does anyone knows how can i configure Squid as a Transparent proxy 
using IPFW assuming that i have already configured Squid with Samba 
authentication.
I've configure Squid that allow users to log on pages using their smb 
account but i have to configure every computer on my Lan to connect to 
the proxy server. How can i configure IPFW and Squid to work as a 
trasnparent proxy to work on every computer authenticating samba users 
in my lan that uses internet explorer.
Net interfaces:
xl0 : 10.254.254.253  --- LAN ip
xl1 : 172.21.14.253    --- This ip is used to make the SMB 
authentication and get the internet connection
Requeriments:
OS: FreeBSD 5.2
Authentication module: smb_auth
Firewall: IPFW
Could anyone please send me a configuration that has been proved or any 
idea? i have already read the FAQ about squid transparent proxy but any 
of the configurations works with samba authentication and IPFW


 
 
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