[ 2168.903889][T17620] gre: GRE over IPv4 demultiplexor driver
[ 2170.743788][T17643] ip_gre: GRE over IPv4 tunneling driver
[ 2223.194471][T18221] ip6_gre: GRE over IPv6 tunneling driver
[ 2240.931992][T18420] ping (18420) used greatest stack depth: 22032 bytes left
[ 2258.686552][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 2263.806513][    C3] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 2268.222487][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 2273.407490][    C1] ip6_tunnel: tep0 xmit: Local address not yet configured!