[ 3568.159333][T17427] gre: GRE over IPv4 demultiplexor driver
[ 3570.218981][T17450] ip_gre: GRE over IPv4 tunneling driver
[ 3632.635932][T18026] ip6_gre: GRE over IPv6 tunneling driver
[ 3670.387508][T18369] ping (18369) used greatest stack depth: 23360 bytes left
[ 3676.438961][    C3] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 3682.519869][    C1] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 3687.894869][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 3694.102879][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!