For instance:Ībove command will monitor all incoming request and log them to /var/log/squid/access_log file. See access log file /var/log/squid/access.log using the tail command or more command or less command. How do I test my squid proxy is working correctly? You do not have to setup up individual browsers to work with proxies. Point all desktop clients to your eth1 IP address (192.168.2.1) as Router/Gateway (use DHCP to distribute this information). # chkconfig squid on Desktop / Client computer configuration Start or restart or reload the squid server. Execute script so that system will act as a router and forward the ports:Īlso, check all our complete firewall tutorials for Alpine Linux Awall, CentOS 8, OpenSUSE, RHEL 8, Ubuntu Linux version 16.04 LTS/ 18.04 LTS/ 20.04 LTS, and 22.04 LTS. Iptables -t nat -A PREROUTING -i $INTERNET -p tcp -dport 80 -j REDIRECT -to -port $SQUID_PORT Iptables -t nat -A PREROUTING -i $LAN_IN -p tcp -dport 80 -j DNAT -to $SQUID_SERVER : $SQUID_PORT # DNAT port 80 request comming from LAN systems to squid 3128 ($SQUID_PORT) aka transparent proxy Iptables -append FORWARD -in -interface $LAN_IN -j ACCEPT Iptables -table nat -append POSTROUTING -out -interface $INTERNET -j MASQUERADE # set this system as a router for Rest of LAN Iptables -A INPUT -i $INTERNET - m state -state ESTABLISHED ,RELATED -j ACCEPT # Load IPTABLES modules for NAT and IP conntrack support Script first configure Linux system as router and forwards all http request to port 3128 (Download the fw.proxy shell script): # iptables -t nat -A PREROUTING -i eth0 -p tcp -dport 80 -j REDIRECT -to-port 3128 Next, I had added following rules to forward all http requests (coming to port 80) to the Squid server port 3128 using the iptables command # iptables -t nat -A PREROUTING -i eth1 -p tcp -dport 80 -j DNAT -to 192.168.1.1:3128 Here is the complete listing of nf for your reference (grep will remove all comments and sed will remove all empty lines, thanks to David Klein for quick hint ): http_access allow lan: - same as above.http_access allow localhost: Squid access to LAN and localhost ACL only.acl lan src 192.168.1.1 192.168.2.0/24: Access control list, only allow LAN computers to use squid.
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