Configuring option 82
Bill Shirley
bill at c3po.polymerindustries.biz
Fri Sep 27 13:25:08 UTC 2019
Yeah, I had found that web page too. But note later on that page he states about his patch:
This has been tested on a Xeon 2.8 Ghz server, it uses just a few percent of CPU with 40.000 DHCP clients.
Do you have 40,000 clients?
I use many classes in my DHCP configurations on 15+ servers. I haven't had a problem
with DHCP eating up all the resources.
What is you goal here? Are you wanting to assign a fixed address for each client?
Bill
On 9/27/2019 7:32 AM, Surya Teja wrote:
> 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 <mailto: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 <http://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 <mailto: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 <mailto: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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