What Is Packet Sniffer And How Packet Sniffer Work?

What Is Packet Sniffer And How Packet Sniffer Work?

Packet sniffers or protocol analyzers are tools that are mostly used by network experts to diagnose network problems. Packet sniffers can also be used by hackers for spying on network user traffic and steal private information.

Few packet sniffers or protocol analyzers used by network experts are single purpose dedicated hardware solutions while few packet sniffers are software applications that run on standard consumer grade computers, utilizing the network hardware provided on the host computer to perform packet capture and injection tasks.
What Is Packet Sniffer And How Packet Sniffer Work?
What Is Packet Sniffer And How Packet Sniffer Work?

How Packet Sniffers Works?

Packet sniffers work by intercepting and logging network traffic that they can see via the wired or wireless network interface that the packet sniffing software has access to on its host computer.

On a wired network, what can be captured depends on the structure of the network. A packet sniffer might be able to see traffic on an entire network or only a certain segment of it, depending on how the network switches are configured, placed, etc. On wireless networks, packet sniffers can usually only capture one channel at a time unless the host computer has multiple wireless interfaces that allow for multichannel capture.

Once the raw packet data is captured, the packet sniffing software must analyze it and present it in human-readable form so that the person using the packet sniffing software can make sense of it. The person analyzing the data can view details of the conversatio or converstation happening between two or more nodes on the network. Network experts can use this information to determine where a fault lies, such as determining which device failed to respond to a network request.

Hackers can use sniffers to eavesdrop on unencrypted data in the packets to see what information is being exchanged between two parties. They can also capture information such as passwords and otp or bank account information. Hackers can also capture packets for later playback in replay, man-in-the-middle, and packet injection attacks that few systems may be vulnerable to.

What Kind Of Software Tools Are Used in Packet Sniffing?

Just like everybody else, both network engineers and hackers love free stuff, which is why open source and freeware sniffer software applications are often the tools of choice for packet sniffing tasks. One of the more popular open source offerings is Wireshark.

How Can I Protect My Network from Bad Hackers Using Sniffers?

If you are a network expert or administrator and you want to see if anyone on your network is using a sniffer tool, check out a tool called Antisniff. Antisniff can detect if a network interface on your network has been put into promiscuous mode, which is the required mode for packet capture tasks.

Another way to protect your network traffic from being sniffed is to use encryption such as SSL or TLS. Encryption does not prevent packet sniffers from seeing source and destination information, but it does encrypt the data packet's payload so that all the sniffer sees is encrypted gibberish. 

Any attempt to modify or inject data into the packets would likely fail since messing with the encrypted data would cause errors that would be evident when the encrypted information was decrypted at the other end.

Sniffers are great tools for diagnosing down-in-the-weeds network problems. Unfortunately, they are also useful for hacking purposes as well. It is important for security professionals to familiarize themselves with these tools so they can see how a hacker might use them on their network.
What Is Packet Sniffer And How Packet Sniffer Work? What Is Packet Sniffer And How Packet Sniffer Work? Reviewed by Redbuddy on May 31, 2019 Rating: 5

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