request for advice / building dhcpd infraestructure

[Niall O'Reilly]

On Thu, 25 Jun 2015 16:02:15 +0100,
Leandro wrote:
> 
> Simon / Bob , totally understood about shared-network concept, thank
> you very much.
> Last question,
> About "relay-circuit-id parameter" ; when should be use ?

  Avoid this if you can.  Use it only if you really must.  I expect
  you don't need it.  It's useful when the circuit can be used to
  identify the customer, and probably not otherwise.

> Im currently running some openwrt relay agents in bridge mode with a
> management range ip (172.X.X.X).

  Does this help?

> This ip can not be use as default gateway for clients behind the relay
> so It make not sense for gi-addr propose either?

  If the management range shares a broadcast domain with a client
  range, they need to be configured in the same shared-network.  In
  this case, you must take care not to provide a dynamic pool for the
  management range, or else find a means to keep clients from using
  such a pool, so that clients can't acquire an address from this
  range.

> Is in this case when I should use option 82 ?

  Keep things simple.  First design a clean (layer 3) network
  topology, then overlay an IP addressing plan on top of that, then
  configure your DHCP server to match the addressing plan.  If you
  still need some result which this approach can't deliver, it's time
  to explore specialized options, but not before.

  Best regards,
  Niall O'Reilly