The Treck/Kasago network stack appears to be running on the remote host. Note that this plugin is based on a detection method provided by JSOF (https://www.jsof-tech.com/). The plugin sends a special packet to the host and looks for a specific type of ICMP response packet. If the response is not received (for example, the host does not respond to the special packet or the response is blocked by a device between the scanner and the host), the plugin cannot make a determination. Failure to receive the specific type of ICMP packet in the response does not necessarily indicate that the remote host does not use the Treck/Kasago network stack.