Description of problem:

leto:~# ip tunnel add foo mode gre local 1.1.1.1 remote 2.2.2.2
ioctl: No such device
leto:~# modprobe ip_gre
leto:~# ip tunnel add foo mode gre local 1.1.1.1 remote 2.2.2.2
leto:~# 

Version-Release number of selected component (if applicable):
module-init-tools-3.3-0.pre1.4.17

How reproducible:
Every time

Additional info:
Adding "alias gre0 ip_gre" to /etc/modprobe.conf fixes this. I can't think
of a valid reason for it not to be there by default.