-pcap Network Type 276 Unknown Or Unsupported- Link

( -T 1 sets link type to Ethernet)

In the registry of standard PCAP link-layer types (maintained by the tcpdump.org project), every number corresponds to a specific protocol encapsulation. When your analysis tool throws this error, it means the PCAP file header claims the data is encapsulated using protocol number 276, but the version of the tool you are using does not have a dissector (a decoder) built-in for that specific number. -pcap network type 276 unknown or unsupported-