[ 1428.264978][T22075] gre: GRE over IPv4 demultiplexer driver
[ 1428.757286][T22098] ip_gre: GRE over IPv4 tunneling driver
[ 1445.186530][T22672] ip6_gre: GRE over IPv6 tunneling driver
[ 1453.721044][T23016] ping (23016) used greatest stack depth: 22944 bytes left
[ 1456.633180][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 1458.746133][    C3] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 1460.601128][    C1] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 1462.649132][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!