How to Configure Squid 3.x as Transparent Proxy on CentOS 7

 

vi /etc/squid/squid.conf

# Squid normally listens to port 3128

http_port 3128  transparent

visible_hostname proxyserver.nagarajanewlife.com

acl our_network  src 192.168.1.0/24

http_access allow our_network

firewall-cmd --permanent --zone=public --add-forward- port=80:proto=tcp:toport=3128:toaddr=192.168.1.175

firewall-cmd --permanent --zone=public --add-port=3128/tcp
firewall-cmd --permanent --add-masquerade

firewall-cmd --reload

systemctl restart squid

# firewall-cmd --list-all


$ sudo vi /etc/sysctl.conf
then change the following parameter to ‘1’, i.e.
net.ipv4.ip_forward = 1
Save file & exit. Now execute the following command to implement the changes made,
$ sudo sysctl -p






Dhcp server configure 

vi /etc/dhcp/dhcpd.conf
edit the default gateway 192.168.1.175 # systemctl restart squid