[ 1833.542436][T15132] gre: GRE over IPv4 demultiplexer driver
[ 1834.030354][T15155] ip_gre: GRE over IPv4 tunneling driver
[ 1850.761136][T15737] ip6_gre: GRE over IPv6 tunneling driver
[ 1856.739462][T15987] ping (15987) used greatest stack depth: 21576 bytes left
[ 1861.783787][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 1863.831729][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 1865.751762][    C3] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 1867.864747][    C3] ip6_tunnel: tep0 xmit: Local address not yet configured!