Netrate

из дерева исходных кодов надо брать src/tools/tools/netrate

Description netreceive is a UDP packet sink; packets received are copied to user space and discarded.

netsend is a UDP packet generator, sending at a rate configured on the command line.

netblast is a UDP packet generator, sending at as high a rate as possible.

These tools are repackaged from the FreeBSD source tree (/usr/src/tools/tools/netrate).