Monitoring TCP/UDP packet content for signatures that usually indicate the exchange of malicious code (e.g.Such packet sniffers are usually tools related to debugging, testing and profiling for specific application scenarios. Monitoring traffic for specific protocols, ports and end-systems for transfer times and protocol specific analysis.Some of the constructive ways packet sniffing can be used includes: The general tendency is to associate packet sniffers with hacking because of its ‘stealth mode’ capabilities and a history of utilizing them for unethical purposes. Having said that, most advanced network security tools usually incorporate aspects of packet sniffing to identify the presence of malicious code or content on the local network. Capturing is performed at the hardware level rather than at the transport or even the application level. In contrast, network sniffers are less invasive and more transparent. mail server, proxy server) and have access to content flowing through those servers. The other option is to attach to specific edge servers (e.g. In this mode, the tool behaves as a proxy that receives incoming data on specific ports and then forwards data to intended destinations. A packet sniffer, on the other hand, is used to access the actual information that is exchanged between resources.Ī network monitoring tool usually behaves as a direct intermediary in the traffic flow path. remote hosts, local services, etc.) and the frequency of access. Learn more about monitoring transmitted data by taking a course at ĭifferences with Network Monitoring ToolsĪ network monitoring tool is usually employed for measurement traffic volumes and to break down data in the form of specific resources accessed (e.g. The sniffer is capable of receiving a copy of every packet transmitted through the attached network interface regardless of socket type, (TCP/UDP) port number and protocol. This computer can be a workstation or a gateway that routes network data between workstations. Packet sniffers are usually attached to a network interfaces at a very low level (layer 4 of the OSI model). The name is derived from how data is transferred over the network, either TCP or UDP, which is in the form of structured blocks of bytes called ‘packets’. A packet sniffer is a program or device that allows monitoring and capturing of data that is transferred between two computers over a network.
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