Set an absolute limit on the number of connections a single
client IP can use. Any more than this and Squid will begin to drop
new connections from the client until it closes some links.
Note that this is a global limit. It affects all HTTP, HTCP, and FTP
connections from the client. For finer control use the ACL access controls.
Requires client_db to be enabled (the default).
WARNING: This may noticeably slow down traffic received via external proxies
or NAT devices and cause them to rebound error messages back to their clients.