[ 3988.693707][T20088] gre: GRE over IPv4 demultiplexor driver
[ 3990.840289][T20111] ip_gre: GRE over IPv4 tunneling driver
[ 4052.181329][T20683] ip6_gre: GRE over IPv6 tunneling driver
[ 4078.810127][T20932] ping (20932) used greatest stack depth: 23232 bytes left
[ 4094.724763][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4100.740630][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4105.861628][    C1] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4112.004625][    C3] ip6_tunnel: tep0 xmit: Local address not yet configured!