[ 1525.709375][T12956] gre: GRE over IPv4 demultiplexer driver
[ 1526.180237][T12979] ip_gre: GRE over IPv4 tunneling driver
[ 1532.133746][T13231] ping (13231) used greatest stack depth: 23120 bytes left
[ 1543.418314][T13550] ip6_gre: GRE over IPv6 tunneling driver
[ 1556.254131][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 1558.493154][    C3] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 1560.477102][    C1] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 1562.590088][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!