-pcap Network Type 276 Unknown Or Unsupported- <RELIABLE EDITION>

The error message refers to the LINKTYPE_LINUX_SLL2 header format, which was introduced to replace the older LINKTYPE_LINUX_SLL (Linux cooked capture) format.

The error message typically occurs when you try to open a packet capture file in an outdated version of Wireshark or TShark .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

capinfos capture.pcap file capture.pcap hexdump -C capture.pcap | head -n 1 The error message refers to the LINKTYPE_LINUX_SLL2 header

Old Wireshark/TShark versions (e.g., those bundled with Ubuntu 20.04) 2. Solutions to Fix the Error /dev/null | hexdump -C

Download the latest "Stable Release" from the official Wireshark website.

dd if=capture.pcap bs=1 skip=20 count=2 2>/dev/null | hexdump -C