Subject: fe80::/64 route missing on GRE tunnels

From: "Steinar H. Gunderson" <[email-masked]>
Date: Tue, 11 Feb 2014 22:55:11 +0100

Hi,

It seems that recent kernels no longer automatically add the link-local route
to GRE tunnels. 3.10.27 does it right:

  root@morgental:~# ip tunnel add foo mode gre remote 1.2.3.4 ttl 64
  root@morgental:~# ip link set foo up mtu 1468
  root@morgental:~# ip -6 route show dev foo
  fe80::/64  proto kernel  metric 256 

but on 3.13.1, no such route shows up. I can add it manually, though.

This broke our in-house IPv6 tunnel broker (which essentially uses link-local
addresses over GRE tunnels to bring up BGP sessions). Do you think you could
have a look?

/* Steinar */
-- 
Homepage: http://www.sesse.net/