[ 3493.207524][T29859] gre: GRE over IPv4 demultiplexor driver
[ 3494.598908][T29882] ip_gre: GRE over IPv4 tunneling driver
[ 3533.661311][T30455] ip6_gre: GRE over IPv6 tunneling driver
[ 3546.723960][T30655] ping (30655) used greatest stack depth: 22928 bytes left
[ 3560.319300][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 3564.223243][    C3] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 3568.064209][    C1] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 3571.967269][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!