-pcap Network Type 276 Unknown Or Unsupported- Page

Unlike the older LINKTYPE_LINUX_SLL (Type 113), the format includes additional metadata that helps in multi-interface captures:

"pcap: network type 276 unknown or unsupported" typically occurs because your version of Wireshark or TShark is too old to recognize newer Link-Layer Header Types. Nick vs Networking Network type corresponds to LINKTYPE_LINUX_SLL2 -pcap network type 276 unknown or unsupported-

Or use od (octal dump) to check the file’s global header: Unlike the older LINKTYPE_LINUX_SLL (Type 113), the format

The specific error citing "network type 276" points to a specific mismatch. In the registry of PCAP link types, value 276 (decimal) typically corresponds to . Infiniband is a high-performance, low-latency interconnect architecture often used in high-performance computing (HPC) clusters and supercomputers. Unlike standard Ethernet, Infiniband handles data transmission differently, and when IP traffic is routed over this medium, it requires a specific encapsulation format. When a network engineer attempts to open a capture taken from an Infiniband environment in an older or standard distribution of Wireshark that has not been compiled with Infiniband support, the software looks up the value 276, finds no corresponding dissector in its dictionary, and returns the "unknown or unsupported" error. Ubuntu 22

Ubuntu 22.04, libpcap 1.10.1, tshark 4.0.5