[ 4448.461956][T26206] gre: GRE over IPv4 demultiplexor driver
[ 4450.788601][T26229] ip_gre: GRE over IPv4 tunneling driver
[ 4518.368292][T26809] ip6_gre: GRE over IPv6 tunneling driver
[ 4548.647208][T27102] ping (27102) used greatest stack depth: 22416 bytes left
[ 4559.438538][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4565.006421][    C1] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4569.870436][    C1] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4575.758431][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!