+ * XXX - should we show the upper 16 bits of the addresses?
+ * Do so only if "vflag" is set?
+ * Section 3.3 "FC Port and Node Network Addresses" says that
+ *
+ * In this specification, both the Source and Destination
+ * 4-bit NAA identifiers SHALL be set to binary '0001'
+ * indicating that an IEEE 48-bit MAC address is contained
+ * in the lower 48 bits of the network address fields. The
+ * high order 12 bits in the network address fields SHALL
+ * be set to 0x0000.
+ *
+ * so, for captures following this specification, the upper 16
+ * bits should be 0x1000, followed by a MAC address.