Check the global header. In a standard pcap, bytes 20-23 contain the link-layer header type (little-endian). For DLT 276, you will see: 0x14 0x01 0x00 0x00 (since 276 decimal = 0x0114 hex).
Thus, 276 may represent a proprietary, corrupted, or mis-identified link type. -pcap network type 276 unknown or unsupported-
Ask vendor or check specs
To avoid generating Type 276 files initially, capture on a (e.g., eth0 ) instead of using any . Capturing on a standard Ethernet interface typically uses LINKTYPE_ETHERNET (Type 1), which is supported by all versions of Wireshark. Decoding the "pcap network type 276 unknown or
, consider capturing with --dlt=276 or saving as pcapng instead – it handles unknown DLTs more gracefully. Thus, 276 may represent a proprietary, corrupted, or
Use this if you are looking for a solution.