[ 3667.496208][T26772] gre: GRE over IPv4 demultiplexor driver
[ 3669.700713][T26795] ip_gre: GRE over IPv4 tunneling driver
[ 3731.131038][T27368] ip6_gre: GRE over IPv6 tunneling driver
[ 3757.968205][T27617] ping (27617) used greatest stack depth: 23360 bytes left
[ 3773.689465][    C1] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 3779.640399][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 3784.696388][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 3790.649386][    C1] ip6_tunnel: tep0 xmit: Local address not yet configured!