This is an old revision of the document!
The current version is in the download directory on kernel.org.
New versions will be announced on the netdev mailing list.
The current iproute2 source is maintained in the GIT repository. To get the current source use:
$ git clone git://git.kernel.org/pub/scm/linux/kernel/git/shemminger/iproute2.git
You can also browse the source online via gitweb.