Computer Networking and Management Lesson 1


Real Internet Delays and Routes



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Computer Networks and Internet - Overview
Real Internet Delays and Routes
What do real Internet delay & loss look like
Traceroute program provides delay measurement from source to router along end-end Internet path towards Computer Networking and Management
Page 35 of 44

destination. For all i l
sends three packets that will reach router ion path towards destination l
router i will return packets to sender l
sender times interval between transmission and reply.
Example:
traceroute: gaia.cs.umass.edu to www.eurecom.fr
Packet Loss
l
Queue (aka buffer) preceding link in buffer has finite capacity l
When packet arrives to full queue, packet is dropped (aka lost) l
Lost packet maybe retransmitted by previous node, by source end system, or not retransmitted at all
Exercise: Try a traceroute command if you are using Linux or tracert if you are using windows and note the result
Syntax: tracert Example tracert nccedu.com
GOTO TOP

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