It happens pretty often that I’ll come across an interesting PCAP file that I want to share with others. Unfortunately, divulging these packet captures can give away certain sensitive information such as an organizations internal IP range, IP addresses of sensitive company assets, MAC addresses of critical hardware that could identify the product vendors, and more.
Fortunately, there is a tool which helps alleviate some of these issues. The tool is called Tcprewrite and is actually a part of the Tcpreplay suite. Tcpreplay is used to send packets from a PCAP back across the wire, but the suite actually contains a few other useful tools.Tcprewrite itself can be used to add and modify packet fields within PCAP files.
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