What happens during a DgIpServ session?

This document is written so that users of the EtherLite's "DgIpServ" utility might better understand how it works, and where problems might occur if it doesn't work as expected.

Details on how communication between an EtherLite and a Host looks during a DgIpServ session:

1. Power-cycle the EtherLite.

2. The EtherLite sends a DHCP Discover broadcast with
     EL MAC address
     All IP addresses set to 0.0.0.0

3. The Host (running DgIpServ) sends BOOTP/DHCP Packet with
     EL MAC address
     EL assigned IP address
     Host IP address
     Firmware file name
     Gateway address set to 0.0.0.0

4. The Host sends a DHCP Discover broadcast with the same parameters as in 3.

5. The EtherLite sends an ARP REQ with
     EL address as senders address (MAC & IP)
     EL address as target address (IP)

6. The Host sends an ARP REPLY with
     Host address as senders address (MAC & IP)
     EL address as target address (MAC & IP)

7. The EtherLite sends an ARP REQ with
     EL address as senders address (MAC & IP)
     Host address as target address (IP)

8. The EtherLite sends a TFTP REQ

9. The Host sends a data packet (firmware file)

10. The EtherLite ack's data packet [...]