Two subnets in DHCP Server

[Karl Auer]

On Thu, 2009-09-03 at 09:18 -0400, Rashkae wrote:
> Tim Frost wrote:
> > It should NOT be necessary, unless the router at 143.93.79.254 can't
> > convert a DHCP broadcast to a dedicated (unicast) request to the server
> > at 143.93.77.181. 
> 
> I'm really not sure about this... If the router converts a DHCP
> broadcast to a unicast request at 143.98.77.181, then wouldn't the dhcp
> server simply assign an address in that subnet?

Tim is talking about DHCP relaying. A bit in the DHCP request identifies
a relayed packet, and the server then responds using the relay
information in the packet, ignoring the fact that the packet arrived on
this or that interface.

You can have relays in hundreds or even thousands of subnets, all
relaying DHCP requests from their subnets to one central server, and the
server will sort them out.

> Also, it was my understanding that DHCPD figures out which network
> devices to listen on for each subnet declaration by the subnet that
> interface already belongs too.

That is true for normal DHCP packets, but not for relayed requests.

Regards, K.

-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Karl Auer (kauer at biplane.com.au)                   +61-2-64957160 (h)
http://www.biplane.com.au/~kauer/                  +61-428-957160 (mob)

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