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From: Martin Gallagher on 11 Jul 2006 01:58
On Mon, 10 Jul 2006 07:39:02 -0700, Joel wrote:

> Merv wrote:
>
>> The DHCP relay agent will insert the PRIMAY IP address of the interface
>> that the DHCP request was recived on. So the DHCP server configuration
>> must take this into account when configuring the scope. You might want
>> to think about moving to a new block where you can have two contigous
>> blocks ...
>
> Merv,
>
> We will be moving to a contiguous block in the future. For now I need
> to implement this solution to keep us going.
>
> You said "The DHCP relay agent will insert the PRIMAY IP address of
> the interfacethat the DHCP request was received on".
>
> So if the DHCP request is received on interface is 10.1.2.1 and the
> secondary is 10.1.6.1 any requests received from the .6 subnet will
> cause the DHCP relay agent to be 10.1.2.1?

Also see the "ip dhcp smart-relay" command. The router will start using
secondary addresses as the giaddr after it stops receiving replies to
requests sent with the primary address as giaddr. The subnet any random
host ends up in is a lottery.

--
Rgds,
Martin
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