[ 4000.264376][T19787] gre: GRE over IPv4 demultiplexor driver
[ 4002.336628][T19810] ip_gre: GRE over IPv4 tunneling driver
[ 4064.923825][T20382] ip6_gre: GRE over IPv6 tunneling driver
[ 4093.270921][T20633] ping (20633) used greatest stack depth: 23360 bytes left
[ 4108.920675][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4114.808513][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4119.864537][    C1] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4125.881532][    C3] ip6_tunnel: tep0 xmit: Local address not yet configured!