iproute is a package used for TrafficShaping and as an interface to NetEm typically through the use of the program tc. /sbin/ip is one of the applications in this package and it uses LinuxNetlinkSockets
The home page for this is at http://linux-net.osdl.org/index.php/Iproute2
See also iproute(7) or, much better, ip(8).
Category: NetworkingUtilities
3 pages link to IpRoute: