When we see in ARP request packet in the Target hardware address (THA) field 0000.0000.0000 (instead of FFFF.FFFF.FFFF) maybe it is connected with the older broadcast address standard? I have read in the „TCP/IP Illustrated„ written by Kevin R. Fall and W. Richard Stevens in the “Proxy ARP” chapter that „some used an older broadcast address (a host ID of all 0 bits, instead of the current standard of a host ID with all 1 bits)”. I can’t find more information about this older broadcast address standard. Is my conjecture correct?
Link to the quoted sentence:
https://books.google.pl/books?id=X-l9NX3iemAC&pg=PA175&lpg=PA175&dq="older+broadcast+address"&source=bl&ots=Z2djp_J07L&sig=QDrrrD8QEBtPMOI2mx5iwxZSNlY&hl=pl&sa=X&ei=UrCPVMbYD4a9Ubavg5AC&ved=0CCUQ6AEwAQ#v=onepage&q="older%20broadcast%20address"&f=false