From: Willem de Bruijn <willemb@google.com> Date: 2012-01-26 21:51:12
ip link add gre34 type gre remote 1.2.3.4
I was not aware of the "ip tunnel add ..."
And I was unaware of that method. Interesting. That explains the
alternative codepath in rtnetlink.c. `ip link help` does not mention
gre or gretap on its list of supported types, even though they work.
Thanks for having a look!