[ 4353.533389][T20283] gre: GRE over IPv4 demultiplexor driver
[ 4355.562966][T20307] ip_gre: GRE over IPv4 tunneling driver
[ 4415.720031][T20879] ip6_gre: GRE over IPv6 tunneling driver
[ 4447.014654][T21172] ping (21172) used greatest stack depth: 22416 bytes left
[ 4458.297522][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4464.185438][    C3] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4469.241465][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4475.129452][    C1] ip6_tunnel: tep0 xmit: Local address not yet configured!