typedef  struct port_desc {
    char      *name;            /* Name des Ports                       */
    int16     type;             /* Art des Ports                        */
    int16     active;           /* Flag: Port aktiv oder nicht          */
    uint32    flags;            /* Type dependent operational flags     */
    uint32    ip_addr;          /* IP address of this network adapter   */
    uint32    sub_mask;         /* Subnet mask of attached network      */
    int16     mtu;              /* Maximum packet size to go through    */
    int16     max_mtu;          /* Maximum allowed value for mtu        */
    int32     stat_sd_data;     /* Statistics of sent data              */
    IP_DGRAM  *send;            /* Link to first entry in send queue    */
    int32     stat_rcv_data;    /* Statistics of received data          */
    IP_DGRAM  *receive;         /* Link to first entry in receive queue */
    int16     stat_dropped;     /* Statistics of dropped datagrams      */
    struct drv_desc   *driver;  /* Driver program to handle this port   */
    struct port_desc  *next;    /* Next port in port chain              */
 } PORT;