Traceroute - jibingl/CCNA-CCNP GitHub Wiki

Send Destination Port Reply (on-path/destination) OS
UDP packet Start from 33434 and increase by 1 per UDP Time Exceeded (TTL timeout) / Port Unreachable IOS, Linux
Echo Request None Time Exceeded (TTL timeout) / Echo Reply Windows

Example

tracert 1.1.1.1 from Windows host 10.3.3.172

Packets of send message and reply message on the path:

Packets of reply message from the destination 1.1.1.1: