Practical_modern_SCADA_protocols_-_dnp3,_60870-5_and_Related_Systems

452 Practical Modern SCADA Protocols: DNP3, 60870.5 and Related Systems
This shows the details of the ARP header (data). This was the original Ping from IP
address 192.100.100.2 to 192.100.100.3. Notice that the Dest. Node at the top is
ff.ff.ff.ff.ff.ff. This is because the pinging computer did not know the MAC address of
192.100.100.3.
Notice all 00:00:00:00:00:00 in the target media address line. Computer 3 then responds
in the next packet (number 2)
Click on packet number 2 and note that the sender and destination information reverses.
This is the response from the odd computer. Also note that the sender knows the MAC
address of the destination computer. How?
1.2 3.8 Conclusion
These four programs are very simple but yet give us a great wealth of information on what
is going on in the network. The Winipcfg tells us about the setup of our computer. Ping
tells us we are able to ‘talk’ to another computer. ARP gives us the MAC address of the
other computer and NDG’s PacketBoy allows us to have an intimate view of the communications
on the network.