Retaining information between DHCP requests

Bill Shirley Bill at
Thu Oct 9 21:48:13 UTC 2014

On 10/9/2014 4:32 PM, Simon Hobson wrote:
> Bill Shirley <Bill at> wrote:
>> DHCP is going to either honor the class statement and use the 1st subnet or
>> honor the host statement and not use a pool in the 2nd subnet.
> OK, first time around, kickstart does a DORA sequence and gets and address from the first pool. When it does a request, without giving the vendor option id, it fails to match the class statement, can't have an address from the first pool, so gets shunted off to the second pool - even though it requests the same address, it will be denied. That is exactly what the OP does *not* want to happen until the kickstart install is finished.
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It's been my experience DHCP will only DHCPOFFERto a DHCPDISCOVER from a pool that has allows if the class matches.

However, the DHCP will DHCPACK a DHCPREQUEST for any pool that does not explicitly deny.

What I don't know is if the subsequent requests are DHCPDISCOVERs or DHCPREQUESTs.

BTW Simon, I'm enjoying the discussion.  I'm always willing to learn.


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