[ 4420.158596][T26266] gre: GRE over IPv4 demultiplexor driver
[ 4422.151742][T26289] ip_gre: GRE over IPv4 tunneling driver
[ 4481.224299][T26861] ip6_gre: GRE over IPv6 tunneling driver
[ 4506.911245][T27111] ping (27111) used greatest stack depth: 22400 bytes left
[ 4522.231493][    C1] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4528.247440][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4533.111422][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4538.807441][    C3] ip6_tunnel: tep0 xmit: Local address not yet configured!