As part of adding same test for GRE tunnel with IPv6 underlay, missing bytes for key were found. mausezahn does not fill zeros between two colons, so send them explicitly. For example, use "00:00:00:E9:" instead of ":E9:" Signed-off-by: Amit Cohen <amcohen@nvidia.com> Signed-off-by: Ido Schimmel <idosch@nvidia.com> Signed-off-by: David S. Miller <davem@davemloft.net>