This utility is only for educational purpose.
This utility captures packets from the network
and shows the contents of the packets.
This Utility only works on linux/unix platforms.
The source code is also provided which helps to learn
-- Netdump now has a developers team!
Best linux magazine online
Info and libraries for packets and security info
sniffer construction Tutorial part One
sniffer construction Tutorial part Two
TCP/IP Resources List Online
A quick Overview Of TCP/IP Headers
TCP/IP Illustrated Volume one By Richard Stevens (Buy This Book)