[ 3151.363144][T20522] gre: GRE over IPv4 demultiplexor driver
[ 3152.541019][T20545] ip_gre: GRE over IPv4 tunneling driver
[ 3188.524492][T21126] ip6_gre: GRE over IPv6 tunneling driver
[ 3208.130548][T21471] ping (21471) used greatest stack depth: 22336 bytes left
[ 3212.382466][    C1] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 3216.094814][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 3219.295345][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 3223.070333][    C1] ip6_tunnel: tep0 xmit: Local address not yet configured!