net-misc/iperf
A TCP, UDP, and SCTP network bandwidth measurement tool
USE Flags
sctp
Global: Support for Stream Control Transmission Protocol
static-libs
Global: Build static libraries
ipv6
Global: Adds support for IP version 6
threads
Global: Adds threads support for various packages. Usually pthreads
debug
Global: Enable extra debug codepaths, like asserts and extra output. If you want to get meaningful backtraces see http://www.gentoo.org/proj/en/qa/backtraces.xml