I forgot to mention, Region and Rack Controllers are in separate VLANs. So the TFTP conversation is happening between the RACK Controller (DHCP/TFTP) and the Machine which both live on the same subnet, so the router's ARP Cache is not a factor.
I forgot to mention, Region and Rack Controllers are in separate VLANs. So the TFTP conversation is happening between the RACK Controller (DHCP/TFTP) and the Machine which both live on the same subnet, so the router's ARP Cache is not a factor.