[ 1403.368682][T20987] gre: GRE over IPv4 demultiplexer driver
[ 1403.980476][T21010] ip_gre: GRE over IPv4 tunneling driver
[ 1413.557154][T21362] ping (21362) used greatest stack depth: 23552 bytes left
[ 1423.090200][T21587] ip6_gre: GRE over IPv6 tunneling driver
[ 1432.561414][T21930] ping (21930) used greatest stack depth: 22816 bytes left
[ 1435.580482][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 1437.884413][    C1] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 1440.061391][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 1442.109393][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!