request for advice / building dhcpd infraestructure

[Bob Harold]

On Tue, Jun 23, 2015 at 2:26 PM, Peter Rathlev <peter at rathlev.dk> wrote:

> On Tue, 2015-06-23 at 15:08 -0300, Leandro wrote:
> > After I run out of those ips, I can do two thinks:
> > a)change the network mask from /24 to /23.
> > b)Add a second /24 subnet behind the relay , for example 1.1.2.0/24 and
> > set a second gateway ip 1.1.2.1/24.
> >
> > option a) is not good since the broadcast domain at /23 could bring many
> > collisions. (its just my opinion).
>
> For a regular Ethernet switched network, /23 doesn't sound like a lot.
> At modern speeds and with modern operating systems the baseline
> broadcast should be negligible.
>
> > option b) Could work but, how does relay agent knows witch ip to use for
> > GI-Adrr ?
> > Can relay agent send both or more than one ips, on the GI-Addr field so
> > dhcpd can figure out from witch range can serve the ip ?
>
> You would use "shared-network" for this. The GI-Addr just has to fall
> within one of the subnets inside the shared-network statement. The DHCP
> server will then hand out an address from a random subnet. Take a look
> at the dhcpd.conf man page for the syntax.
>
> --
> Peter
>
>  Simon, Dave, and Peter are right.  And when you use "shared-network", the
DHCP server will work with any of the gateway addresses that the router
chooses to send in the GiAddr field.  DHCP treats all the subnets in the
shared-network as one group of IP's to hand out.

Bob Harold
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