[ 1509.505771][T12030] gre: GRE over IPv4 demultiplexer driver
[ 1509.916359][T12053] ip_gre: GRE over IPv4 tunneling driver
[ 1517.035596][T12403] ping (12403) used greatest stack depth: 23520 bytes left
[ 1525.099328][T12628] ip6_gre: GRE over IPv6 tunneling driver
[ 1530.381795][T12877] ping (12877) used greatest stack depth: 22656 bytes left
[ 1535.084592][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 1537.069562][    C3] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 1538.925562][    C1] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 1540.845578][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!