DHCP response to source address not helper address

[Jason Brandt]

That's pretty much what we figured, but just wanted to make sure before moving on. Thanks for the response.

Jason K. Brandt

Sent from my iPad

On Jun 26, 2013, at 4:56 PM, Steven Carr <sjcarr at gmail.com> wrote:

> On 26 June 2013 22:46, Jason Brandt <jbrandt at fsmail.bradley.edu> wrote:
>> We are running a mixed environment of mostly public addresses, with some
>> private (nat'd) addresses.  We are trying to use one pair of DHCP servers to
>> service all networks.  The problem we've run into, is that instead of
>> responding to source address, the DHCP server responds to the giaddr address
>> in the DHCP packet.  Is there any way to force the server to respond to
>> source address?  Here's an example of a request packet (1.98 is the
>> translated source IP, 190.111 is DHCP server):
> 
> The problem is the DHCP server is on the "other" side of the NAT
> gateway and the DHCP response is sent as a unicast packet to the
> GIADDR. To get this to work you need a NAT gateway/firewall that has
> the ability to modify/manipulate/translate the packets so that they
> make sense on either side of the gateway (not sure which vendors have
> this capability for DHCP) - or reside to the fact you need additional
> DHCP server(s) on the un-NAT'd side.
> 
> Steve
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