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ngrep no es un sniffer, estas totalmente equivocado. solo es como el nombre lo dice Network Grep.
saludos
simple, man ngrep te dira en las primeras lineas que es lo que es.
Citarngrep strives to provide most of GNU grep's common features, applying
them to the network layer. ngrep is a pcap-aware tool that will allow
you to specify extended regular expressions to match against data pay‐
loads of packets. It currently recognizes TCP, UDP and ICMP across
Ethernet, PPP, SLIP, FDDI and null interfaces, and understands bpf fil‐
ter logic in the same fashion as more common packet sniffing tools,
such as tcpdump( and snoop(1).