[ 4255.719077][T19687] gre: GRE over IPv4 demultiplexor driver
[ 4257.344665][T19710] ip_gre: GRE over IPv4 tunneling driver
[ 4305.207001][T20281] ip6_gre: GRE over IPv6 tunneling driver
[ 4333.048321][T20631] ping (20631) used greatest stack depth: 23440 bytes left
[ 4338.167316][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4343.031208][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4347.191182][    C1] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4352.055175][    C1] ip6_tunnel: tep0 xmit: Local address not yet configured!