I think the only magic lines deviating from the defaults are: no_cache deny all forwarded_for off via off The first disables caching, and the last

I think the only magic lines deviating from the defaults are: no_cache deny all forwarded_for off via off The first disables caching, and the last two are for a little extra privacy. You can verify if you're caching by checking your cache spool for files: find /var/spool/squid/ -type f