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I think I might have seen this question here
already but I missed the answer if any.
According to RFC 2131
a DHCP client after receiving DHCP_ACK message
from DHCP server but before configuring network
interface must verify the validity of offered IP address
supposely by broadcasting ARPOP_REQUEST message
and reading ARPOP_REPLY in a case the offered
IP address already exists.
Here is the problem: according to ARP specs
given in RFC (forgot which one), ARPOP_REQUEST
message must have both sender's hardware address
and IP address fields filled in, otherwise the message
would be discarded by other hosts.
How the heck would I fill in sender's IP address if
the DHCP client by then will not have any IP address yet?
Thanks,
Sergei
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