[ 4399.674953][T22015] gre: GRE over IPv4 demultiplexer driver
[ 4401.326105][T22038] ip_gre: GRE over IPv4 tunneling driver
[ 4450.305047][T22611] ip6_gre: GRE over IPv6 tunneling driver
[ 4477.783185][T22954] ping (22954) used greatest stack depth: 23488 bytes left
[ 4482.900526][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4487.828469][    C1] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4492.500428][    C3] ip6_tunnel: tep0 xmit: Local address not yet configured!
[ 4497.365506][    C2] ip6_tunnel: tep0 xmit: Local address not yet configured!