List and set data link type

"-L/--list-data-link-types" option is used to list available data link types: 

# tcpdump -L
Data link types for enp0s3 (use option -y to set):
  EN10MB (Ethernet)
  DOCSIS (DOCSIS) (printing not supported)

Beware that the output may be different if the interface works in different modes (e.g., monitor mode or not).

As prompted, "-y datalinktype/--linktype=datalinktype" option can be used to set data link type to capture packets: 

# tcpdump -y EN10MB

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