ngrep

ngrep strives to provide most of GNU grep's common features, applying them
to the network layer. ngrep is a pcap-aware tool that allows you to specify
extended regular or hexadecimal expressions to match against data payloads
of packets. It currently recognizes IPv4/6, TCP, UDP, ICMPv4/6, IGMP and
Raw across Ethernet, PPP, SLIP, FDDI, Token Ring and null interfaces, and
understands BPF filter logic in the same fashion as more common packet
sniffing tools, such as tcpdump and snoop.

          

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License: BSD-4-Clause
URL: https://github.com/jpr5/ngrep