[ 1483.061019][  T525] gre: GRE over IPv4 demultiplexer driver
[ 1483.519647][  T548] ip_gre: GRE over IPv4 tunneling driver
[ 1499.170728][ T1120] ip6_gre: GRE over IPv6 tunneling driver
[ 1506.556774][ T1463] ping (1463) used greatest stack depth: 23344 bytes left
[ 1509.431020][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 1511.414986][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 1513.271988][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 1515.255041][    C1] ip6_tunnel: tep0 xmit: Local address not yet configured!