(This gadget is able to send custom ICMP, UDP and TCP packets and receive all response information. It is inspired by the ping command, but its capabilities go far beyond ping. It also includes a small traceroute module and supports IP segmentation. This tool can be useful when common tools cannot trace/ping/probe a host with a firewall. It can often help you find out the rule set of the firewall, of course, you can also learn the TCP/IP protocol through it, and do some experiments on the IP protocol.)
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