The home page for netem is http://developer.osdl.org/shemminger/netem/
It is designed to do similar work to dummynet for FreeBSD and shares some code with NISTNet.
This software is used within the WandGroup for simulating loss, delay and congestion.
To build it into the Kernel you need these symbols set at least:
lib/main.php:944: Notice: PageInfo: Cannot find action page