[ 4658.535974][T23261] gre: GRE over IPv4 demultiplexor driver
[ 4660.674951][T23284] ip_gre: GRE over IPv4 tunneling driver
[ 4723.648979][T23863] ip6_gre: GRE over IPv6 tunneling driver
[ 4751.580367][T24119] ping (24119) used greatest stack depth: 21552 bytes left
[ 4767.742371][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4773.758255][    C1] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4778.942262][    C3] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4785.021250][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!