[Proxy] Trasparent proxy to hide a real proxy?

[dupa]

My current configuration is

Computer A -> Proxy Server X -> Internet

I don't manage the Proxy Server X and I can't change it to become a trasparent proxy.

When people use a Trasparent proxy, they don't know they are using a proxy.
What I include in [[..]] is invisible to Computer B
Computer B -> [[trasparent proxy server Y]] -> Internet

I want to do a different thing.
I want to use a Trasparent Proxy Y on a network where the only way to access internet is through Proxy Server X so that computer B will not need to know that there is a proxy.

Something like this

Computer B -> [[trasparent proxy server Y -> Proxy Server X]] -> Internet


Any idea?

[dupa]

any idea?

[dupa]

No ideas...

[SeijiSensei]

Maybe an iptables rule on machine Y that looks something like this:

iptables -t nat -A PREROUTING -p tcp -m tcp --dport 80 -j DNAT --to-destination ip.of.server.a:3128

That grabs outbound HTTP traffic and forwards it to the Squid port on server A.