First off we need to understand that traceroute is a technique to have the routers between the source and destination reveal themselves and finally have the destination reveal itself. Traceroute can be implemented using ICMP, UDP, and even TCP so as a CCIE when someone asks you to filter "traceroute" you should get a little background as to the traceroute application/OS's being used to trigger the reply from the destination. Example: Windows uses ICMP echoes by default, most Linux OS's use UDP... Read More

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