Every packet in a pcap or pcap-ng file begins with a . This header describes the encapsulation of the packet—Ethernet, Wi-Fi, Linux cooked capture, Bluetooth, etc. The pcap file format stores a numeric code for this encapsulation, known as the DLT (Data Link Type) , defined in the pcap.h header file and standardized by the libpcap library.
Thus, 276 may represent a proprietary, corrupted, or mis-identified link type. -pcap network type 276 unknown or unsupported-
By understanding DLTs, using editcap to force a link type, updating your libpcap, or converting to pcapng, you can almost always recover the packets. In the world of network forensics, data is king. Do not let a three-digit number stand between you and your analysis. Every packet in a pcap or pcap-ng file begins with a