Anritsu Network Master Pro MT1000A - Page 190

IPv4
The Protocol ID is fixed to 0, and the Ethertype field depends on the
upper protocol layer.
'SNAP' is not possible without 'LLC1'.
Touching the IPv4 layer button displays the parameters available for the
Internet Protocol version 4 layer.
IPv4 header is defined in RFC 791 as below.
Ethernet Applications Ethernet Setup and Status
MT1000A Network Master Pro Page 190