[ 4633.071225][T25555] gre: GRE over IPv4 demultiplexor driver
[ 4635.256417][T25579] ip_gre: GRE over IPv4 tunneling driver
[ 4664.329736][T25837] ping (25837) used greatest stack depth: 22152 bytes left
[ 4701.462623][T26156] ip6_gre: GRE over IPv6 tunneling driver
[ 4747.704503][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4754.105445][    C3] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4759.480524][    C1] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4766.008498][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!