Description: Ngrep or Network Grep is a utility which can be used to find patterns and search at the network layer live using pcap filters, regular and hexadecimal expressions. Ngrep can currently decode and search for patterns in protocols such as IP, TCP, UDP, IGMP, ICMP, PPP etc. In the most typical use case, Ngrep can help debug protocol implementations, process pcap files, observe binary protocols or even act as a basic sniffing tool. Please visit the Ngrep Usage Page for more details.It might be useful checkout the videos on Packet Sniffing using TcpDump and WireShark. The videos are available here:<br><br>1. Packet Sniffing using TcpDump<br>2. Packet Sniffing using WireShark<br><br>Links:<br><br>1. Ngrep Official Website on SourceForge<br><br>
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