DLT_NULL
{ DLT_NULL, 0, 0, 0 },
case DLT_NULL:
{ DL_TPB, DLT_NULL, 0 }, /* IEEE 802.4 Token Bus */
{ DL_METRO, DLT_NULL, 0 }, /* IEEE 802.6 Metro Net */
{ DL_CHAR, DLT_NULL, 0 }, /* Character Synchr. proto */
{ DL_CTCA, DLT_NULL, 0 }, /* IBM Channel-to-Channel */
{ DL_FC, DLT_NULL, 0 }, /* Fibre Channel interface */
{ DL_X25, DLT_NULL, 0 }, /* X.25 LAPB interface */
{ DL_ISDN, DLT_NULL, 0 }, /* ISDN interface */
{ DL_MPFRAME, DLT_NULL, 0 }, /* Multi-protocol Frame Relay */
{ DL_ASYNC, DLT_NULL, 0 }, /* Character Asynch. Protocol */
{ DL_IPX25, DLT_NULL, 0 }, /* X.25 Classical IP */
{ DL_LOOP, DLT_NULL, 0 }, /* software loopback */
{ SUNW_DL_VNI, DLT_NULL, 0 }, /* Virtual network interface */
{ DL_OTHER, DLT_NULL, 0 }, /* Mediums not listed above */