iproute2 is a software package that provides various tools for advanced routing,
tunnels, and traffic control.
iproute2 was originally designed by Alexey Kuznetsov, and is well known for
implementing QoS in Linux kernels and is now maintained by Stephen Hemminger.
The primary site for iproute2 is http://linux-net.osdl.org/index.php/Iproute2
and its main documentation site is http://www.lartc.org.
The most important tools that iproute2 provides are ip and tc.