[ 4456.182414][T26033] gre: GRE over IPv4 demultiplexor driver
[ 4458.332822][T26056] ip_gre: GRE over IPv4 tunneling driver
[ 4519.327033][T26631] ip6_gre: GRE over IPv6 tunneling driver
[ 4545.106224][T26880] ping (26880) used greatest stack depth: 23360 bytes left
[ 4559.800994][T27018] ping (27018) used greatest stack depth: 23160 bytes left
[ 4560.766307][    C3] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4566.653203][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4571.517251][    C1] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4577.213230][    C3] ip6_tunnel: tep0 xmit: Local address not yet configured!