ngrep
A PCAP-based network packet analyzer that applies grep-like pattern matching to packet payloads across multiple protocols.
What is ngrep?
ngrep is a network packet analyzer that applies grep-like pattern matching to packet payloads. It's a PCAP-based tool that allows security professionals and network administrators to search for specific data patterns within network traffic across multiple protocols. The tool helps identify anomalous communications, debug plaintext protocols, and analyze network behavior.
Network administrators, security analysts, and developers who need to inspect and analyze network traffic patterns for debugging, forensics, or security monitoring purposes.
Developers choose ngrep because it combines the familiar grep syntax with powerful packet capture capabilities, offering a unique approach to network traffic analysis that's more focused on payload content than traditional packet sniffers.
Overview
ngrep is like GNU grep applied to the network layer. It's a PCAP-based tool that allows you to specify an extended regular or hexadecimal expression to match against data payloads of packets. It understands many kinds of protocols, including IPv4/6, TCP, UDP, ICMPv4/6, IGMP and Raw, across a wide variety of interface types, and understands BPF filter logic in the same fashion as more common packet sniffing tools, such as tcpdump and snoop.
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