[ 3512.393101][T17605] gre: GRE over IPv4 demultiplexor driver
[ 3514.387599][T17629] ip_gre: GRE over IPv4 tunneling driver
[ 3574.247542][T18203] ip6_gre: GRE over IPv6 tunneling driver
[ 3591.017541][T18358] ping (18358) used greatest stack depth: 23600 bytes left
[ 3616.314701][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 3622.266633][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 3627.386635][    C1] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 3633.275646][    C1] ip6_tunnel: tep0 xmit: Local address not yet configured!