I have a large scope of 7,700 IPs that I want my proxy to allow and block everything else. Is such a large block possible with Squid?
Do you mean something like:
acl allow_net src 192.168.0.1-192.168.0.254
acl all src 0.0.0.0/0.0.0.0
acl whitelist somedomain .google.com .mycompany.com
http_access allow whitelist allow_net
http_access deny all
This blocks everything except a few IP's and firewall devices/modems. Is this what you mean? However, may the UNIX gods help you maintaining an acl list of 7700 ip's manually. Answer to your question: yes it will block everything you want.