[ 3932.621110][T20077] gre: GRE over IPv4 demultiplexor driver
[ 3934.762459][T20100] ip_gre: GRE over IPv4 tunneling driver
[ 3996.678275][T20673] ip6_gre: GRE over IPv6 tunneling driver
[ 4023.995239][T20922] ping (20922) used greatest stack depth: 23360 bytes left
[ 4040.245875][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4046.325769][    C3] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4051.381774][    C3] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4057.397808][    C1] ip6_tunnel: tep0 xmit: Local address not yet configured!