[ 1881.006479][T11857] gre: GRE over IPv4 demultiplexer driver
[ 1881.631007][T11880] ip_gre: GRE over IPv4 tunneling driver
[ 1900.034762][T12453] ip6_gre: GRE over IPv6 tunneling driver
[ 1910.009245][T12797] ping (12797) used greatest stack depth: 23040 bytes left
[ 1913.168820][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 1915.472787][    C1] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 1917.647812][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 1920.144795][    C3] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 1946.535273][T13834] ping (13834) used greatest stack depth: 22832 bytes left