[ 4222.121683][T19749] gre: GRE over IPv4 demultiplexor driver
[ 4223.658615][T19772] ip_gre: GRE over IPv4 tunneling driver
[ 4270.278842][T20344] ip6_gre: GRE over IPv6 tunneling driver
[ 4293.222045][T20637] ping (20637) used greatest stack depth: 24048 bytes left
[ 4302.130510][    C1] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4306.866416][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4311.026406][    C3] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4315.698437][    C3] ip6_tunnel: tep0 xmit: Local address not yet configured!