The program run against loopback interace "lo", not "eth0".
Correct the comment.
Signed-off-by: NWang Sheng-Hui <shhuiw@foxmail.com>
Acked-by: NAlexei Starovoitov <ast@kernel.org>
Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net>