-pcap Network Type 276 Unknown Or Unsupported- May 2026

The error message "pcap: network type 276 unknown or unsupported" typically occurs when you try to open a packet capture file in an outdated version of Wireshark or TShark. The Cause: LINKTYPE_LINUX_SLL2

Known mapping: LinkType 276

• Numeric DLT/LinkType numbers are assigned in various registries; 276 corresponds to a specific DLT in some implementations (vendor / wireless). If your tool prints 276, look up the platform-specific mapping (see next section).

Just ran into this error while trying to process a PCAP file: -pcap network type 276 unknown or unsupported-

Thanks!

If the original data was Linux SLL (Type 113): The error message "pcap: network type 276 unknown