[ 1523.444243][T18314] gre: GRE over IPv4 demultiplexer driver
[ 1523.933161][T18337] ip_gre: GRE over IPv4 tunneling driver
[ 1539.733831][T18908] ip6_gre: GRE over IPv6 tunneling driver
[ 1545.228592][T19157] ping (19157) used greatest stack depth: 23240 bytes left
[ 1550.066894][    C3] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 1552.049859][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 1553.905909][    C1] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 1555.953868][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!