Thanks to your reply.
I use Winpkfilter in local network.
I have some questions about how to capture loopback packets.
In struct _STATIC_FILTER, I use FILTER_PACKET_REDIRECT flag for m_FilterAction. Is it right?
What is data in m_NetworkFilter.m_IPv4.m_ValidFields when I capture loopback packets?
PACKET_FLAG_ON_SEND or PACKET_FLAG_ON_RECEIVE?
Thank you again.