The error message "pcap: network type 276 unknown or unsupported" typically occurs when the pcap library is unable to recognize the network type being used. This can happen for several reasons:
To diagnose, use capinfos (from Wireshark) or file : -pcap network type 276 unknown or unsupported-
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. The error message "pcap: network type 276 unknown
editcap -T 1 input.pcap output.pcap
sudo add-apt-repository ppa:wireshark-dev/stable sudo apt-get update sudo apt-get install wireshark Use code with caution. Copied to clipboard editcap -T 1 input
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