Proxy port: Defaults to 3128. This value sets what port your Squid server will listen on for http requests. Client browsers will need to be configured to connect to a proxy on this port, or transparency will need to be setup, also.

ICP port: The port number where Squid sends and receives ICP requests to and from neighbor caches. Default is 3130. To disable use "0". May be overridden with -u on the command line.

Incoming TCP Address: Defaults to none. Defines the HTTP socket which accepts connections from clients and other caches.

Outgoing TCP Address: Defaults to none. Defines the HTTP socket for connections made to remote servers and other caches.

Outgoing UDP Address: Defaults to none. Defines the ICP socket receiving packets from other caches.

Incoming UDP Address: Defaults to none. Defines the socket for ICP packets being sent out to other caches.

TCP receive buffer: Size of the TCP buffer. Defaults to the OS receive buffer.