[ 1490.741443][T17331] gre: GRE over IPv4 demultiplexer driver
[ 1491.211173][T17354] ip_gre: GRE over IPv4 tunneling driver
[ 1497.108066][T17607] ping (17607) used greatest stack depth: 23328 bytes left
[ 1507.844208][T17927] ip6_gre: GRE over IPv6 tunneling driver
[ 1518.744732][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 1520.857697][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 1522.777701][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 1524.824703][    C1] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 1580.305724][T20460] ping (20460) used greatest stack depth: 23296 bytes left