Unlike the more traditional traceroute which sends either UDP or ICMP ECHO packets, TCP Traceroute is using TCP packets and, thus, can bypass the most common firewall filters. By default Windows tracert uses ICMP and both Mac OS X and Linux traceroute use UDP. The type of packet that is sent differs depending on the implementation. Does traceroute use UDP or ICMP?Ģ Answers. The ICMP packets provide information about whether the routers used in the transmission are able to effectively transfer the data.
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