DHCP server, duplicate forwards from VRRP'd relays

Tim DeNike tim at denike.us
Tue Oct 31 17:07:58 UTC 2017

Normally you want both to actively forward requests and receive responses.
In the case that you might have ARP inspection or something of the sort
enabled on the routers.  Both routers need to know the servers response.

On Tue, Oct 31, 2017 at 1:00 PM, Brennan,Andrew <andrew.brennan at drexel.edu>

> Ok, so I've looked for what I think I'm looking for in the dhcpd.conf man
> page and can't find it.  But, I might have something in mind that doesn't
> exist - not sure.
> I have two NAT appliances forwarding my client DHCP discover/requests to
> the server and the server - having no configuration otherwise - replies to
> both with corresponding offer packets, etc.  Seems like overkill to me and
> I've opened a case with the vendor to see if I can't configure only the
> active router do the relaying -- but I had a thought that my server *could*
> be configured to know that both relays are doing the same job and that it
> only needs to respond to one of those requests (or prefer one over the
> other, etc.).
> Is there a corresponding configuration that I haven't figured out yet?  Or
> is this something that doesn't exist (yet) in the realm of the ISC DHCPD?
> And, lastly ... if it doesn't exist as an option, would this be a useful
> option/feature for the server?
> Thanks!
> andrew.
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