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http://www.mywanip.com/ - http://www.mywanip.com/
Free utility detects one's current IP address from behind a router. |
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IP Self Test - http://compnetworking.about.com/od/networkprotocolsip/l/aa081000a.htm
This 18-question online quiz tests your knowledge of the nuts and bolts of Internet Protocol. |
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Museum of Broken Packets - http://lcamtuf.coredump.cx/mobp/
Collection of broken, malformed, or peculiar packets found on the Internet, with theories as to how they came to be. |
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Foundations of the Internet Protocol - http://www.acm.org/crossroads/columns/connector/july2000.html
ACM Crossroads magazine article explains network protocol concepts, IP packets, and IP addressing. |
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Connected - The IP Protocol - http://www.freesoft.org/CIE/Course/Section3/
Section 3 of "Connected: An Internet Encyclopedia" discusses datagrams and streams, subnetting, and the delivery model. |