[  737.274340] gre: GRE over IPv4 demultiplexor driver
[  737.439429] ip_gre: GRE over IPv4 tunneling driver
[  746.481219] ip6_gre: GRE over IPv6 tunneling driver
[  748.960556] ping (7703) used greatest stack depth: 12192 bytes left
[  752.186526] ip6_tunnel: tep0 xmit: Local address not yet configured!
[  753.594540] ip6_tunnel: tep0 xmit: Local address not yet configured!
[  754.938512] ip6_tunnel: tep0 xmit: Local address not yet configured!
[  756.346496] ip6_tunnel: tep0 xmit: Local address not yet configured!