Network security is a top priority for administrators and IT decision-makers, as cyber threats evolve and become more sophisticated. Without proper protection, networks are vulnerable to attacks that can result in data breaches, downtime, and significant financial losses. This is where inline security solutions come in, providing an essential component of a comprehensive security strategy.
Inline security is a type of security architecture that involves the use of security tools and devices to inspect and filter network traffic in real-time. Unlike out-of-band security measures like NDR and IDS, inline security devices operate directly in the path of network traffic.
This allows inline security solutions to provide immediate protection against cyber threats, including viruses, malware, and unauthorized access attempts. By deploying inline security tools such as IPS, DLP systems, and NGFW, organizations can reduce their exposure to cyber threats and enhance their overall security posture.
Inline security solutions can be implemented at various points in the network. By implementing inline security measures at strategic locations, organizations can minimize their attack surface and ensure that all network traffic is inspected and filtered for potential threats.
Inline security is an essential component of a comprehensive security strategy. Network attacks can come from various sources, including email, web browsing, and file downloads, and can range from minor nuisances to significant breaches that can compromise sensitive data and damage an organization's reputation.
Inline security solutions allow administrators to monitor and control network traffic in real-time, helping to prevent cyber threats before they reach their target. By placing security devices directly in the network path, administrators can ensure that all traffic is inspected for malicious activity.
Implementing inline security solutions with network Bypass TAPs is an industry best practice leveraged by cybersecurity professionals. The Bypass TAP is designed to be external to the inline security tool and was designed to resolve the problem of an inline security tool creating a point of failure in the network. Bypass TAPs prevent inline devices from being a single point of failure and causing network downtime. Network downtime can be costly for organizations and mean miserable, around-the-clock hours for IT professionals.

In the event the device fails or if there is a power loss, the heartbeat packets that are sent from the Bypass TAP to the inline device trigger the TAP to “bypass” that inline device. This leaves the network link up or triggering a failover to a redundant device. The heartbeats added to the redirected traffic have additional functionality: they allow the Bypass TAP to be aware of the health of an inline appliance.
Additionally, Bypass TAPs give network engineers a means to simplify tool management such as maintenance, installing patches, and making needed updates easier. Bypass TAPs allow for troubleshooting issues with the inline tool and validating the fix before putting the tool back inline. Investing in a Bypass TAP is the perfect way to add or pilot new inline devices in the future, without needing to take the network down.
Implementing inline security solutions with external Bypass TAPs requires careful planning and execution to ensure maximum effectiveness. Here are some best practices for implementing inline security solutions:
By following these best practices, you can implement inline security solutions that provide effective protection for your network and critical assets.
In conclusion, inline security solutions are a crucial part of a comprehensive network security strategy. By implementing external Bypass TAPs alongside inline security solutions, organizations can ensure that their network is protected and the tools delivering the protection are not creating any failure points in the network.
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If the inline security tool goes off-line, the TAP will bypass the tool and automatically keep the link flowing. The Bypass TAP does this by sending heartbeat packets to the inline security tool. As long as the inline security tool is on-line, the heartbeat packets will be returned to the TAP, and the link traffic will continue to flow through the inline security tool.
If the heartbeat packets are not returned to the TAP (indicating that the inline security tool has gone off-line), the TAP will automatically 'bypass' the inline security tool and keep the link traffic flowing. The TAP also removes the heartbeat packets before sending the network traffic back onto the critical link.
While the TAP is in bypass mode, it continues to send heartbeat packets out to the inline security tool so that once the tool is back on-line, it will begin returning the heartbeat packets back to the TAP indicating that the tool is ready to go back to work. The TAP will then direct the network traffic back through the inline security tool along with the heartbeat packets placing the tool back inline.
Some of you may have noticed a flaw in the logic behind this solution! You say, “What if the TAP should fail because it is also in-line? Then the link will also fail!” The TAP would now be considered a point of failure. That is a good catch – but in our blog on Bypass vs. Failsafe, I explained that if a TAP were to fail or lose power, it must provide failsafe protection to the link it is attached to. So our network TAP will go into Failsafe mode keeping the link flowing.
Single point of failure: a risk to an IT network if one part of the system brings down a larger part of the entire system.
Heartbeat packet: a soft detection technology that monitors the health of inline appliances. Read the heartbeat packet blog here.
Critical link: the connection between two or more network devices or appliances that if the connection fails then the network is disrupted.