Jumpstart Winpcap -

And you need a jumpstart.

pcap_t *handle = pcap_open_live("\\Device\\NPF_{GUID}", 65536, 1, 1000, errbuf); pcap_compile(handle, &fp, "tcp", 0, PCAP_NETMASK_UNKNOWN); pcap_setfilter(handle, &fp); pcap_loop(handle, 10, packet_handler, NULL); Your packet_handler will see raw Ethernet, IP, and TCP headers. jumpstart winpcap

Think of it as a tap into the cable. WinPcap installs a kernel-level driver (NPF) plus a DLL interface. Tools like Wireshark, Nmap, and Snort rely on it. Without it, Windows says: “Nice try, but you can’t see the raw frames.” And you need a jumpstart