Many thanks to Yevgeny Kosarzhevsky <yevg@pisem.net> for reporting
and a lot of testing

Thanks to Jan Engelhardt <jengelh@medozas.de> for a lot of advice
Thanks to Denys Fedoryschenko <denys@visp.net.lb> for some sample
code that he tried and thanks to Andreas Henriksson <andreas@fatal.se>
(who maintains iproute2 on debian) for the persistent followup.
Signed-off-by: Jamal Hadi Salim <hadi@cyberus.ca>