ERROR: [ipv6_set_default_route] Given IPv6 default gateway ‘fe80 :: 1’ is link-local
ERROR: [ipv6_set_default_route] Given IPv6 default gateway ‘fe80 :: 1’ is link-local, but no scope or gateway device is specified
If you encounter this error on CentOS6 then remove IPV6_DEFAULTGW=fe80::1 from /etc/sysconfig/network-scripts/ifcfg-eth0 and do a
sercvice network restart
Your IPv6 networking should still be working but there error should be gone.
Worked for me!