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Surprising Blind Spots In Your Network Visibility

December 3, 2014

As the “modern” network continues to grow in size and complexity, the change presents new challenges in network management. One of the most prevalent issues you face today is network visibility.

More and more of your users are connecting remotely with multiple mobile devices – while consuming more data from a greater number of sources. It’s likely that many of these applications are hosted virtually, and your users expect to have immediate access at all times.

Without proper planning and network design, pacifying the needs of your users comes at the cost of your network’s security. The growth (and ensuing complexity) often obstructs your network visibility with "blind spots" that make complete and accurate data capture impossible. These blind spots create windows of opportunity for hackers. Flawed intrusion detection and prevention is a cost you and your clients can’t afford to pay.

What Causes a Lack of End-To-End Visibility?

There are many ways in which network visibility becomes comprised. Perhaps duplicate packets are overwhelming your SPAN ports, limiting the ability of your applications to monitor and protect your network. In a similar vein, you might not be leveraging network TAPs to safeguard against oversubscription and loss of data access. Plus, network monitoring tools often fail to keep pace with upgrades you make to your infrastructure.

Unfortunately, many businesses fail to comprehend the risk and consequences of changes they make to their network. It’s not until a crisis happens that the visibility issues are recognized.

What Your Network Is Missing 7 Tools To TAP

An Investment in Switches

To maintain complete network visibility, many of the world’s largest data centers are beginning to invest in network monitoring switches, including those in investment banking. What is a switch exactly?

A monitoring switch is an intelligent device that connects your monitoring tools to your data center. As with any network, filtering and load balancing is critical to getting all data to the right place while keeping the network running smoothly. A network monitoring switch delivers such data between your tools and data center for complete and proper analysis.

The advent of switches has improved the productivity of data centers, increasing the efficiency of data capture and the effectiveness of your range of applications. Switches also provide intuitive management interfaces that empower you to drag and drop traffic flows to tools without command line interface (CLI) scripting. In all, a switch provides the short-term benefits of complete network visibility as well as the long-term benefits of adaptability to increasing network speeds.

Want to learn about the different types of network tools and applications that help safeguard your data? Download your complimentary copy of What Your Network’s Missing: 7 Tools to TAP.

 

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Heartbeats Packets Inside the Bypass TAP

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.

Glossary

  1. 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.

  2. Heartbeat packet: a soft detection technology that monitors the health of inline appliances. Read the heartbeat packet blog here.

  3. Critical link: the connection between two or more network devices or appliances that if the connection fails then the network is disrupted.

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