net-tools project links:
http://net-tools.sourceforge.net/
https://sourceforge.net/projects/net-tools/
https://wiki.linuxfoundation.org/networking/net-tools
https://sourceforge.net/p/net-tools/code/ci/master/tree/
Linux Kernel source:
http://elixir.free-electrons.com/linux/latest/source/net/ipv4
http://elixir.free-electrons.com/linux/latest/source/net/ipv4/arp.c
The Linux Channel website:
http://the-linux-channel.the-toffee-project.org
