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Bogon Filtering

What is Bogon Filtering?

Bogon filtering is a network security measure that involves the blocking of IP addresses which should not be present on the public internet. These IP addresses, known as "bogons," include private, reserved, and unassigned IP ranges as defined by the Internet Assigned Numbers Authority (IANA). By filtering out these addresses, networks can prevent illegitimate traffic from entering or leaving their systems, enhancing overall security and efficiency.

Bogon addresses can be exploited by malicious actors to carry out various attacks, including spoofing and other forms of cybercrime. Filtering these addresses at network perimeters helps to ensure that only legitimate traffic is allowed through, reducing the risk of such malicious activities.

The Origin of Bogon Filtering

The concept of bogon filtering emerged as the internet expanded and the need for secure and efficient IP address management became evident. In the early days of the internet, IP address allocation was relatively straightforward. However, as more devices connected to the internet, it became crucial to manage and monitor IP address usage more effectively.

The term "bogon" itself is derived from "bogus," reflecting the illegitimacy of these addresses in the context of public internet traffic. Initially, bogon filtering was implemented by internet service providers (ISPs) and large network operators to prevent routing issues and security vulnerabilities associated with unallocated or reserved IP addresses. Over time, this practice has become a standard component of network security strategies.

Practical Application of Bogon Filtering

A practical application of bogon filtering can be seen in enterprise network security. For instance, a large corporation with multiple branches and a centralized data center might implement bogon filtering at its network gateways. By doing so, the company ensures that no traffic from unauthorized or unallocated IP addresses can access its internal network.

In addition to enhancing security, this practice can improve network performance. By filtering out unnecessary and potentially harmful traffic, the network can operate more efficiently, reducing latency and freeing up bandwidth for legitimate users. Many modern firewalls and intrusion detection systems (IDS) include bogon filtering as a built-in feature, making it easier for network administrators to implement and manage.

Benefits of Bogon Filtering

The primary benefit of bogon filtering is enhanced network security. By blocking traffic from invalid IP addresses, networks are protected against a range of potential attacks, including denial of service (DoS) attacks, spoofing, and other malicious activities. This proactive approach helps to maintain the integrity and reliability of the network.

Another significant benefit is improved network performance. By reducing the amount of unwanted traffic, bogon filtering helps to ensure that network resources are used efficiently. This can lead to faster data transmission speeds and a better overall user experience.

Furthermore, bogon filtering supports regulatory compliance. Many industries are subject to stringent data protection and security regulations. Implementing bogon filtering can help organizations meet these requirements by demonstrating that they have robust security measures in place to protect their network infrastructure.


Bogon IP addresses are ranges of IP addresses that are not valid for use on the public internet. They include private, reserved, and unassigned IP addresses.

Bogon filtering can be implemented using network firewalls, routers, and intrusion detection systems that support this feature. Many devices have built-in capabilities for bogon filtering, making it straightforward to configure.

Bogon filtering is important because it helps to block illegitimate traffic from entering or leaving a network, reducing the risk of cyber attacks and improving overall network security.


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