Configuring option 82

[Surya Teja]

Hi Bill Thanks for reply
Why are you avoiding the class statement?
In one of the google forum I have read the statement saying like
The internal implementation in ISC DHCPD of classes is such that it scales
in a non-linar way - O(N^2) or something. So suddenly you'll end up with
dhcpd eating 100% CPU.
So I just want to avoid the classes
While surfing I found that for the host declaration statements we can use
the syntax like

EX: host client-name-1 {
		*host-identifier option agent.circuit-id "dslam42.port22";*
		hardware ethernet 00:e0:4c:a7:ca:de;
		fixed-address 192.168.0.6;
	}

 So I just want to know any config statements similar like above applies
for scope sections

What does the agent.circuit-id and agent.remote-id contain? I can't figure
out why you're using substring on these values (in your original post).
It is just sample example I found in the forum, I don't have issue with
directly checking without using the substring function or binary-to-ascii to
cross check the values

Thanks


On Fri, Sep 27, 2019 at 4:06 PM Bill Shirley <
bill at c3po.polymerindustries.biz> wrote:

> Options in a pool are options to be *sent* not matched.
>
> Why are you avoiding the class statement? What does the agent.circuit-id
> and agent.remote-id contain?
> I can't figure out why you're using substring on these values (in your
> original post).
>
> Bill
> On 9/27/2019 3:44 AM, Surya Teja wrote:
>
> Hi
> It might be too many questions but I wan to configure my dhcpd
> configuration file by avoiding the classes as much as possible
> If the subnet is configured as like below snippet
> subnet 192.168.10.0 netmask 255.255.255.0 {
>   pool {
>          range   192.168.10.10 192.168.10.199;
>         option subnet-mask 255.255.255.0;
>         option routers 10.1.10.1;
>         option domain-name "test.com";
>         option agent.circuit-id "22";
>         option agent.remote-id "192.168.10.242";
>   }
> }
> can we achieve the option 82 configuration setup with above snippet
>  Thanks in advance and or if any reference links to setup the option 82
> functionality without class can also be appreciated
>
> On Thu, Sep 26, 2019 at 7:42 PM Surya Teja <suryateja042 at gmail.com> wrote:
>
>> Hi is the option 82 supported by using class concept only ?
>> or can it be defined as other general options like domain-name server,
>> router in scope section ?
>>
>> On Tue, Sep 24, 2019 at 12:49 PM Surya Teja <suryateja042 at gmail.com>
>> wrote:
>>
>>> Hi,
>>> I am trying to configure the dhcp option 82, went through the google
>>> forums and one of it suggest the syntax like
>>> # vim /etc/dhcp/dhcpd.conf
>>> ########################################################
>>> log-facility local7;
>>>
>>>
>>>
>>>
>>>
>>>
>>> *class "VLAN10" {         match if
>>> binary-to-ascii(10,16,"",substring(option agent.circuit-id,2,2)) = "10"; }
>>> # VLAN10 class "VLAN20" {          match if ( substring(option
>>> agent.remote-id,2,15)="10.5.20.4" and binary-to-ascii(10, 16,
>>> "",substring(option agent.circuit-id, 4, 2)) = "2" ); }*
>>> subnet 192.168.10.0 netmask 255.255.255.0 {
>>>         pool {
>>>                 *allow members of                "VLAN10";*
>>>                 default-lease-time               600;
>>>                 max-lease-time                    7200;
>>>                 range                           192.168.10.1
>>> 192.168.10.199;
>>>                 option routers                  192.168.10.254;
>>>                 option broadcast-address        192.168.10.255;
>>>                 option subnet-mask              255.255.255.0;
>>>                 option domain-name-servers      4.2.2.2;
>>> }
>>> }
>>> subnet 192.168.20.0 netmask 255.255.255.0 {
>>>         pool {
>>>        * allow members of                "VLAN20";*
>>>         default-lease-time              600;
>>>         max-lease-time                  7200;
>>>         range                           192.168.20.20 192.168.20.199;
>>>         option routers                  192.168.20.254;
>>>         option broadcast-address        192.168.20.255;
>>>         option subnet-mask              255.255.255.0;
>>>         option domain-name-servers      4.2.2.2;
>>>
>>> }
>>> (Just ignore ip values)
>>> can we configure this concept only by using classes and make it allow or
>>> deny like that?
>>> or can we use the option space concept to get it worked(do we have any
>>> other syntax). Thanks in advance
>>>
>>
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