# Pass traffic to protocol-specific chains A INPUT -m conntrack -ctstate INVALID -j DROP A INPUT -m conntrack -ctstate ESTABLISHED,RELATED -j ACCEPT # Drop incoming and forwarding packets allow outgoing packets Below is an example configuration, with an explanation of each section provided in the comments. Open the rules.v4 file in a text editor to add the rules. The ip command output lists the available network interfaces and the assigned IP addresses.Īfter installing the persistent firewall, edit the firewall server's configuration to set up basic IPv4 rules.ġ.
Enter the following command to list the available IPv4 connections ip -4 addr show scope global Open the terminal on the web server and follow these steps:ġ. Gather Web Server Network Interface Details Follow the steps below to create an example Nginx web server that only allows access from a private IP address. The first step in configuring firewall-based network access is ensuring the web server accepts only the connections made over the private network. The sections below describe the procedure for setting up a simple Iptables-based firewall that controls network traffic to and from a web server. The application is installed on a proxy server with a dedicated public IP and acts as a gateway that protects the internal network from external threats. The proxy firewall plays an essential role in securing web application infrastructure.
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