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Old 12-18-2004, 02:05 PM   #1
coolfrog
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ICMP Packets

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Hey,
Could anyone gimme an idea where to find a good tutorial for creating ICMP packets for PING,TRACEROUTE etc. in Linux.
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Old 12-18-2004, 03:46 PM   #2
bm17
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I learned how to create ICMP packets by reading the ping source code and the unix header files. I think you have to open a raw IP socket and build the ICMP header yourself.

traceroute doesn't use ICMP packets. It uses UDP packets and fudges the Time-To_live field in the header. The resaon that traceroute does not use ICMP is that it wants to report the normal path of traffic and ICMP packets sometimes get special treatment. traceroute does, however, listen for ICMP replies.
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Old 12-19-2004, 01:51 AM   #3
oulevon
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UNIX Network Programming The Sockets Networking API Volume 1 (Stevens, Fenner, Rudoff) devotes a chapter to creating and writing to raw sockets. Chapter 28 I believe.
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Old 12-19-2004, 05:47 PM   #4
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Thanx guyz.
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Old 12-22-2004, 12:10 PM   #5
baldy3105
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Try looking here - http://www.faqs.org/rfcs/rfc792.html
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