Title: Configuring Pass-Through Server with Public IP and Firewall Punch-Through
In this article, we will discuss how to set up a Pass-Through Server with a public IP and configure Firewall Punch-Through to handle externally initiated traffic.
Understanding Pass-Through Server
A Pass-Through Server is a network device that acts as a gateway for forwarding network traffic between two separate networks. It doesn't perform any processing or routing on the data packets but simply passes them through.
Setting Up the Pass-Through Server
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Assign a Public IP (WAN IP) to the Pass-Through Server. This IP will be used to identify the server externally.
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Punch a hole in the firewall to allow external traffic to reach the Pass-Through Server. This process is also known as Firewall Punch-Through.
Firewall Punch-Through
Firewall Punch-Through is a technique used to establish a connection between two networks that are separated by a firewall. It allows external traffic to reach the Pass-Through Server by creating a temporary hole in the firewall.
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Identify the internal IP address of the Pass-Through Server. This IP will be used to identify the server internally.
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Configure the firewall to forward incoming traffic on the public IP to the internal IP of the Pass-Through Server.
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Ensure that the Pass-Through Server is configured to accept incoming connections on the port specified in the firewall rules.
Code Example
# Firewall configuration
firewall-cmd --permanent --zone=public --add-port=8080/tcp
firewall-cmd --reload
In the above example, we are configuring the firewall to permanently allow incoming TCP traffic on port 8080 and reloading the firewall rules.
Summary
- Pass-Through Server: A network device that forwards network traffic between two separate networks.
- Public IP: A unique IP address assigned to the Pass-Through Server to identify it externally.
- Firewall Punch-Through: A technique used to establish a connection between two networks separated by a firewall.