[ 1508.297612][T16964] gre: GRE over IPv4 demultiplexer driver
[ 1508.722240][T16987] ip_gre: GRE over IPv4 tunneling driver
[ 1523.581177][T17566] ip6_gre: GRE over IPv6 tunneling driver
[ 1528.654928][T17815] ping (17815) used greatest stack depth: 23208 bytes left
[ 1533.237987][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 1535.157952][    C3] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 1536.949954][    C3] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 1538.869966][    C1] ip6_tunnel: tep0 xmit: Local address not yet configured!