"pcap: network type 276 unknown or unsupported" typically occurs when you attempt to open a packet capture file created using a modern Linux link-layer header (like LINKTYPE_LINUX_SLL2 ) in an outdated version of
If you only need to look at the payload and don't care about the SCLP headers, you can try converting the file using editcap (a command-line tool bundled with Wireshark).
Yes. When capturing, disable mpacket mode on your interface (if your driver allows it):
Issue parsing PCAP - "network type 276 unknown or unsupported"
If you want, I can: