Why does this not work.

[Christian Kratzer]

Hi,

On Fri, 27 Jun 2014, Glenn Satchell wrote:

> host-identifier only works with dhcpv6 options so this will never work
> with dhcpv4. See the dhcpd.conf man page and search for host-identifier.


it does work for v4 with recent isc dhcp versions.

I use this regularly:

     host foo {
 	host-identifier option agent.subscriber-id "test1";
 	fixed-address XX.XX.XX.219;
     }

The prerequisites are:

- recent dhcp version

- fixed-address matches subnet

- agent options match

Greetings
Christian


>
> regards,
> -glenn
>
> On Fri, June 27, 2014 7:04 pm, Simon Hobson wrote:
>> Thomas Raabo - Zitcom A/S <tr at zitcom.dk> wrote:
>>
>>> Really no one?
>>
>> If you demand a response within 15 hours, then pay for a support contract.
>> If you ask on an open support list, where all support is provided by
>> volunteers within the constraints of having a personal life and earning a
>> living, then be prepared for an answer when someone has time to give it.
>> http://www.catb.org/~esr/faqs/smart-questions.html#idp54192224
>>
>>
>>> I wanted to do something like
>>>
>>>
>>> subnet 9x.xx.xx.0 netmask 255.255.255.0 {
>>>         option routers 91.133.32.1;
>>>         option domain-name-servers 8.8.8.8, 8.8.4.4;
>>>         max-lease-time 28800;
>>> }
>>> host test3 {
>>>      host-identifier option agent.subscriber-id ?sv-e-pe-3.g0/0/0.100";
>>>      fixed-address 9x.xx.xx.2;
>>>  }
>>>
>>>
>>> But this does not work?
>>>
>>>
>>> But this does
>>>
>>> class "sv-e-pe-3.g0/0/0.100" {
>>>         match if option agent.subscriber-id = "sv-e-pe-3.g0/0/0.100";
>>> }
>>> subnet 9x.xx.xx.0 netmask 255.255.255.0 {
>>>         option routers 91.133.32.1;
>>>         option domain-name-servers 8.8.8.8, 8.8.4.4;
>>>         max-lease-time 28800;
>>>         pool {
>>>         deny dynamic bootp clients;
>>>         allow members of "sv-e-pe-3.g0/0/0.100";
>>>         range 9x.xx.xx.2;
>>>         }
>>> }
>>>
>>>
>>> What is the difference?
>>
>> The difference ? One uses host statements, one uses classes <rolleyes>.
>> They also have significant differences in how leases are handled - fixed
>> addresses handed out with host statements never appear in the lease
>> database, and don't go through the normal lease lifecycle (no DNS updates,
>> no expiry).
>>
>> Why doesn't the first option work ? I *think* a host statement is limited
>> to identifying a host by it's hardware (MAC) address - therefore the host
>> statement doesn't actually have a statement that the server recognises as
>> matching anything.
>>
>>
>> _______________________________________________
>> dhcp-users mailing list
>> dhcp-users at lists.isc.org
>> https://lists.isc.org/mailman/listinfo/dhcp-users
>>
>>
>
>
> _______________________________________________
> dhcp-users mailing list
> dhcp-users at lists.isc.org
> https://lists.isc.org/mailman/listinfo/dhcp-users
>

-- 
Christian Kratzer                   CK Software GmbH
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