How do I configure a firewall with a proxy on Linux?

How do I configure a firewall with a proxy on Linux?

To configure a firewall with a proxy on Linux, you can use tools like iptables or firewalld along with a proxy server like Squid. Would you like a step-by-step guide?

Yes, please provide the steps.

First, install Squid using your package manager. Then, configure the Squid configuration file to set up the proxy settings. After that, use iptables to allow traffic through the proxy port. Finally, test the configuration to ensure it's working.

What specific iptables commands should I use?

You can use commands like iptables -A INPUT -p tcp --dport 3128 -j ACCEPT to allow traffic on the default Squid port. Make sure to adjust the port if you've configured Squid to use a different one.

How can I check if the firewall is blocking any traffic?

You can check the iptables rules with iptables -L -v to see the traffic statistics. Additionally, you can use tools like tcpdump to monitor traffic.