Companies use a number of network tools and operations to support and safeguard their businesses. Computer forensics is one of them.
So, what is computer forensics and computer forensic analysis?
PCMag defines computer forensics as “the investigation of a computer system believed to be involved in cybercrime. Forensic software provides a variety of tools for investigating a suspect PC. Such programs may copy the entire hard drive to another system for inspection, allowing the original to remain unaltered.”
In addition, “network forensics deals with the capture and inspection of packets passing through a selected node in the network. Packets can be inspected on the fly or stored on disk for later analysis.”
The Different Types Of Computer Forensics
As the above description might lead you to guess, there are various types of forensics that support the different situations your business could encounter.
Ethernet Forensics
Ethernet forensics is a method that uses monitoring tools or sniffers to supervise bit streams from your entire network or from specific times or types of network traffic. This data is connected directly to a host address. Ethernet data capture puts a host’s network interface card into promiscuous mode to copy all of its traffic. It should be noted, though, that this content could be encrypted.
Internet Forensics
From Web browsing and email traffic to peer-to-peer and chat traffic, the Internet could bear evidence of illegal information or network access. Internet forensics is used to capture this type of data and prove the exact origin of potentially incriminating material or determine who is using a specific computer.
TCP/IP Forensics
Network data and packets generated by TCP are directed by IP and marked with source and destination information for routers to interpret. But, to be done correctly, your routers need to know where to send the packet information, which is often done by routing tables. To identify users associated with harmful activity, authentication logs are also a source of important information. These data sources are essential to track an attacker on your network.
Proper Network Connection
Gaining access to complete network traffic is essential for successful computer forensics and analysis. SPAN ports may not capture complete network traffic data if they become oversubscribed or aren’t available. In addition, forensic tools may need to monitor multiple network segments simultaneously or aggregate or replicate data to multiple network tools. A network TAP provides you with the flexibility you need to accomplish any of these objectives.
If you’re going to safeguard your business and network, a forensics tool is a valuable asset to connect to your network. Especially if you operate in an industry that collects or uses sensitive information, leveraging such computer forensic analysis tools is a smart, proactive business decision.
Want to learn more about the many network tools that help you manage your network? Download What Your Network Is Missing: 7 Tools To 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.
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.