ARP and DHCP: one more question

Sergei Viznyuk (sviznyuk@columbus.rr.com)
Tue, 20 Jan 1998 18:43:56 -0500

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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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I think I might have seen this = question=20 here
already but I missed the answer if=20 any.
 
According to RFC 2131
a DHCP client after receiving = DHCP_ACK=20 message
from DHCP server but before = configuring=20 network
interface must verify the validity = of offered IP=20 address
supposely by broadcasting = ARPOP_REQUEST=20 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=20 message
would be discarded by other hosts.
How the heck would I fill in sender's IP address=20 if
the DHCP client by then will not have any IP address = yet?
 
Thanks,
Sergei
 
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