[ 4452.688158][T25969] gre: GRE over IPv4 demultiplexor driver
[ 4454.807808][T25993] ip_gre: GRE over IPv4 tunneling driver
[ 4515.137248][T26571] ip6_gre: GRE over IPv6 tunneling driver
[ 4541.696011][T26820] ping (26820) used greatest stack depth: 23648 bytes left
[ 4557.192634][    C1] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4563.016567][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4567.944621][    C3] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4573.832554][    C0] ip6_tunnel: tep0 xmit: Local address not yet configured!