COLD is both a network sniffer and a protocol analyzer. It is distributed freely, so its usage is free and the package is freely available. A sniffer is a network monitoring and protocol analyzing tool which allows to study, maintain and troubleshoot networks by extracting flowing data and printing out the contents and structure. COLD has been developed for troubleshooting, educational, security and commercial purposes only. COLD runs on Linux and the currently available version has been compiled for a K6 Slakware 7.1 2.2.18. COLD is included in the Trinux distribution. COLD is distributed in binary form only. The COLD homepage is located at: http://www.ipv4.it/cold/