Linux - NetworkingThis forum is for any issue related to networks or networking.
Routing, network cards, OSI, etc. Anything is fair game.
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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.
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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