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ngrep.sourceforge.net
Basic packet sniffing is easy with ngrep. It supports BPF filter logic, which means to say constraining what ngrep sees and displays is as easy as saying something like ``ngrep host foo.bar.com and port 25''. Following are a few examples of common invocations of ngrep to do basic packet sniffing. Please note the usage of ``any'' as the specified ethernet adaptor to attach to; in most recent UNIX l
ngrep 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 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
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