[ 4401.063839][T22422] gre: GRE over IPv4 demultiplexor driver
[ 4403.116513][T22445] ip_gre: GRE over IPv4 tunneling driver
[ 4465.472578][T23017] ip6_gre: GRE over IPv6 tunneling driver
[ 4486.949783][T23216] ping (23216) used greatest stack depth: 21992 bytes left
[ 4508.116643][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4513.939429][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4519.059491][    C3] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4524.947425][    C3] ip6_tunnel: tep0 xmit: Local address not yet configured!