omapi and agent.remote-id

[Matej Mailing]

Jeff, thanks. I will look at it. Can you please send me some part of
the subclass definitision dhcpd configuration file that you are using
in combination with omapi commands you use in the meantime?

Thanks,
Matej

2012/2/17 Jeff Waller <jeffw at cnxntech.com>:
>
> On Feb 16, 2012, at 5:49 PM, Matej Mailing wrote:
>
>> For a smaller to middle-sized ISP there is a number of 10k static IP
>> allocations and we are using option 82 agent.remote-id to define them
>> currently as subclasses via the configuration file. As restarting of
>> the DHCP server for every addition / change of the systems behind
>> seems to take quite some time and can (in some cases where the every
>> time-generated configuration file has some errors in it) also stop the
>> server, using omapi with the previously described use case seems to be
>> a good solution. Please correct me if I'm wrong.
>
> We do a similar thing with OMAPI (9.4K MACS) but using subclasses.  No restart
> necessary.
>
>>
>> Jeff, I cant find the patches you mention, could you please help me
>> with some directions on how to find them?
>
> Here you go:
>
> https://lists.isc.org/pipermail/dhcp-users/2012-January/006837.html
>
> Tell me how it works out.
>
>>
>> Also if anyone is using a setup I am planning to achieve, please let
>> me know about the performance and known issues.
>
> Performance:  Takes < 1 second to add/delete.  Not sure about restart
> time to parse the lease file (30 seconds maybe?).
>
> You should  be prepared to invalidate previous leases as create and delete
> subclasses.
>
>
>>
>> TIA,
>> Matej
>>
>> 2012/2/16 Jeff Waller <jeffw at cnxntech.com>:
>>> You say subnets, but do you mean subclasses?
>>>
>>> subclasses are better because it's far more efficient in terms of lookup
>>> complexity.  Subclass lookup is hashed O(1) while host lookup is linear O(n).  Are
>>> you saying new to 4.2 host lookup is also hashed?
>>>
>>>
>>> On Feb 16, 2012, at 8:21 AM, Matej Mailing wrote:
>>>
>>>> Hi,
>>>>
>>>> I have looked at some posts about the issue but was not successful on
>>>> getting it to work via omapi. My idea is to set a host with its' fixed
>>>> address entirely via omshell. Since 4.2 it is possible to use only
>>>> host declatation for declarding a static IP address to a host (no more
>>>> need to create subnets) and an option of using omapi for such a
>>>> declaration would be very useful for users with large amounts of
>>>> static IP allocations:
>>>
>>> Can you define large?
>>>
>>>>
>>>> host hostname {
>>>> host-identifier option agent.remote-id XX:XX:XX:XX:XX:XX;
>>>> fixed-address aaa.aaa.aaa.aaa;
>>>> }
>>>
>>>
>>>
>>>>
>>>> There is no complete information if it is supported or not on the
>>>> current version or no and I am looking for more information about it.
>>>
>>> Take a look at the source code for dhcp in server/omapi.c starting
>>> around line 2640
>>>
>>> in particular the functions
>>>
>>> dhcp_host_set_value
>>> dhcp_host_get_value
>>> dhcp_host_destroy
>>> dhcp_host_stuff_values
>>> dhcp_host_lookup
>>> dhcp_host_create
>>>
>>> to get an idea of the values that are supported
>>>
>>> in addition, there are other supported objects, although (see my post
>>> in January)  some of them are buggy, but you can apply my patches.
>>>
>>> -Jeff
>>>
>>>>
>>>> TIA,
>>>> Matej
>>>> _______________________________________________
>>>> dhcp-hackers mailing list
>>>> dhcp-hackers at lists.isc.org
>>>> https://lists.isc.org/mailman/listinfo/dhcp-hackers
>>>
>