MicroNugget: How to Use Trace Route (TRACERT)

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In this video, Keith Barker covers Trace Route. When you want to know the path a packet's going to take through the network, Trace Route reveals it, one hop at a time. But what's happening behind the scenes of Trace Route is even more interesting than the path it reveals.

The magic of Trace Route depends on the time to live (TTL) mechanism: TTL is a simple tool that helps prevent loops on a network by instructing each router, as it receives a packet, how many relays that packet has left before it has to get killed. A router decrements a packet's TTL by one before passing it on, and if a router receives a packet with TTL of one, it stops the relay and sends an error message to the originator. A Trace Route takes advantage of that by sending packets with short TTLs and monitoring where the error messages come from.

Watch as Keith configures and edits a network before your eyes, sniffing connections to show, line-by-line what Trace Route does and how it uses TTL.

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It's mesmerizing the energy this guy has!

ivandrofly

Super helpful, thank you! I also get a massive kick out of the character he gives to the routers.
"I am so sorry I can't forward this packet"
*throws it on the ground and stomps on it*
"Also, I killed it for you :)"

tehfailbot

Thank you for this lesson! It was pretty cool to learn more about the trick behind tracert :)

itsAnaMC

Thanks for the thorough and precise explanation of subject

mrbanaly

Very well delivered! Timeless education :)

WholeTargetHealth

Great video Keith, really informative, thanks again.

GoodGameOKC

oh my I love you so much for this video!!!! now I understand about UDP, but what's the different between TCP and UDP? Do you have video explain the easy way about this? thanks

stomperr