request for advice / building dhcpd infraestructure

[Leandro]

Simon / Bob , totally understood about shared-network concept, thank you 
very much.
Last question,
About "relay-circuit-id parameter" ; when should be use ?
Im currently running some openwrt relay agents in bridge mode with a 
management range ip (172.X.X.X).
This ip can not be use as default gateway for clients behind the relay 
so It make not sense for gi-addr propose either? Is in this case when I 
should use option 82 ?

Thanks in advance;
Leo.




On 24/06/15 17:55, Simon Hobson wrote:
> Leandro <ingrogger at gmail.com> wrote:
>
>> My concern is that, if relay1 still using 1.1.0.1 for gi-addr ; dhcpd can pick a lease from pool4 instead using pool2 since 1.1.0.1  falls into the 1.1.0.0/22 declared on shared network.
> That is because the config you have given is BROKEN and will not work.
>
> As Bob has said, you do not define a large shared network.
>
> You start off with a subnet declaration for subnet 1.1.0.0/24 and a subnet declaration for subnet 1.1.2.0/24 - *NO* shared network.
>
> When (say) the 1.1.0.0 subnet starts getting full and you add the 1.1.1.0/24 subnet, you then declare a shared network *for that network only*. Ie :
> shared-network public0 {
>    subnet 1.1.0.0 ...
>    subnet 1.1.1.0 ...
> }
>
> When the 1.1.2.0 subnet gets full, you can add the extra subnet and a second shared network :
>
> shared-network public2 {
>    subnet 1.1.2.0 ...
>    subnet 1.1.3.0 ...
> }
>
> With this correct setup, you do not need to do anything at all - the DHCP server will take care of things automagically.
>
> Of course, if the relevant IP range is still unused (as in this example) you do not need to add a second subnet and shared network, you can just change 1.1.0.0/24 to 1.1.0.0/23 and expand your range(s) - there really will be no performance issues to worry about.
>
>
>
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