Transparent proxy plus outsite proxy

[Jose Noto <jose.noto@xxxxxxxxxx>]

Good morning,

I am seting up a Transparent proxy using squid where we already have a 
proxy server provided by our ISP and I am having some troubles. If I 
congure in the browser connections my ISP proxy, internet is working 
fine but I am not using the transparent proxy (the proxy server doesn't 
log anything) and if I don't configure it I cannot see any website 
because I am not using the external proxy, but my squid server is 
working trying to resolve all the requests. How can I integrate my ISP 
proxy on the squid proxy server? Is there something to do with my 
iptables rules that should redirect to my ISP proxy server?

Many thanks.

Jose