Meaning of logmessages

Glenn Satchell glenn.satchell at
Wed Sep 28 02:23:41 UTC 2011

>> This might be a good place to make an observation about the contents of
>> the DHCPACK that is sent in response to a DHCPINFORM, as compared to one
>> sent in response to a DHCPREQUEST.  The one sent in response to a
>> contains only the options found in the subnet and shared network
>> configurations.  If you have overridden any of these options in a group
>>(for a
>> static reservation) or pool (for a dynamic range), those are not sent.
>> So when
>> a workstations gets initially configured due to the DORA, at some time
>> later, when an INFORM goes out, it's options may change.
>>    This was of significant to us due to a set of workstations that were
>> being directed to a reserved set of DNS servers, and a special
>> gateway.  They
>> existed in a shared network where all the other workstations were our
>> standard default.  I had written the configurations to place all the
>> options in
>> the shared network, and the special options into the group
>> configuration.
>> The workstations would function for a few hours, then fall apart after
>> the INFORM.  I had to move the default options into the pool clauses and
>> duplicate them into the group clauses.
> Thank you, good to know!
> Even though it sounds less like a description of the intentend behaviour
> and more like the description of a bug.

The DHCPINFORM sends less information than a DHCPREQUEST, so the dhcp
server is only able to match the subnet settings. So it's really a
limitation of the protocol.


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