[ 4444.338238][T26225] gre: GRE over IPv4 demultiplexor driver
[ 4446.392099][T26248] ip_gre: GRE over IPv4 tunneling driver
[ 4508.201674][T26820] ip6_gre: GRE over IPv6 tunneling driver
[ 4545.084308][T27164] ping (27164) used greatest stack depth: 22416 bytes left
[ 4551.086997][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4557.101898][    C3] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4562.221908][    C1] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4568.109911][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!