You need to use squid ACCESS CONTROLS feature called maxconn. It puts a limit on the maximum number of connections from a single client IP address. It is an ACL that will be true if the user has more than maxconn connections open. It is used in http_access to allow/deny the request just like all the other acl types.
Step # 1: Edit squid conf file
Open /etc/squid/squid.conf file:
# vi /etc/squid/squid.conf
Step # 2: Setup maxconn ACL
Locate your ACL section and append config directive as follows:
acl ACCOUNTSDEPT 192.168.5.0/24
acl limitusercon maxconn 3
http_access deny ACCOUNTSDEPT limitusercon
- acl ACCOUNTSDEPT 192.168.3.0/24 : Our accounts department IP range
- acl limitusercon maxconn 3 : Set 3 simultaneous web access from the same client IP
- http_access deny ACCOUNTSDEPT limitusercon : Apply ACL
Save and close the file.
Restart the squid server, enter:
# /etc/init.d/squid restart