Here at work we have an Squid proxy setup, and every employee has an user and a password. This works great most of the time, but at the IT department is a problem because lots of software can't be updated throught a proxy.
I've thought of setting up an iptables redirection in one of the servers, so when we need to update some problematic software in a machine, we can just point its gateway to that server and let the redirection do the work.
But I don't know how to do it. To redirect to a local squid is fairly easy, but how do I redirect to a remote squid that needs user and password?
Important: we'll use my user and password for every request, so asking for the authentication is not the problem, but how to pass it, being always the same, to the proxy.