[ 4687.154873][T23243] gre: GRE over IPv4 demultiplexor driver
[ 4689.361001][T23266] ip_gre: GRE over IPv4 tunneling driver
[ 4754.975315][T23837] ip6_gre: GRE over IPv6 tunneling driver
[ 4778.455054][T24036] ping (24036) used greatest stack depth: 21992 bytes left
[ 4801.757864][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4808.093762][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4813.277761][    C1] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4819.485759][    C3] ip6_tunnel: tep0 xmit: Local address not yet configured!