http://www.cisco.com/en/US/products/sw/iosswrel/ps1831/products_tech_note09186a00800a6057.shtml
http://tcpipguru.com/how-does-ping-work/
http://www.antionline.com/showthread.php?237944-PING-What-happens
http://www.freesoft.org/CIE/Topics/53.htm
http://en.wikipedia.org/wiki/Traceroute
http://openmaniak.com/ping.php
http://www.inetdaemon.com/tutorials/troubleshooting/tools/ping/how_ping_works.shtml
In case of traceroute, icmp is used by windows for outbound and UDP is used by cisco routers for outbound.
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