I was working on DHCP lab As seen in the below figure when I take a pcap between e2 and R1 [in a situation where i shutdown the f0/0 interface on R1 and startup again] I see an ARP happening after DHCP Discover.
However when I remove the R1 machine from network and setup a fresh machine and once the machine comes up for the very first I see DORA happening without any ARP.
Screenshots as below
However if I bring the machine up for the first time in network I see below pcap
I want tpo know why an ARP is happening after DHCP discover and that ARp is initiated from the DHCP Server ..which makes me confirm that it is not ARP probe, as per rfc2131