-pcap Network Type 276 Unknown Or Unsupported- ~upd~

This error typically occurs when a packet capture is created using a modern version of tcpdump or libpcap on a newer Linux kernel (often using the -i any interface flag) and then opened with an of Wireshark, TShark, or another analysis tool that does not yet recognize this newer link-layer type. Summary of Link Type 276 Name: LINKTYPE_LINUX_SLL2 Value: 276

od -An -j20 -N4 -I yourfile.pcap

Future work includes:

A security team was auditing a fleet of medical IoT devices (insulin pumps) that communicated via 802.15.4 (ZigBee). They captured traffic using a dedicated USB dongle which wrote pcap files with DLT 276 (mapped to DLT_IEEE802_15_4_TAP ). When they transferred the file to their central Linux analysis server (running RHEL 7 with an older libpcap), they received the error: -pcap network type 276 unknown or unsupported-