DHCP-Relay duplicating unicast packets

Ray Soucy rps at maine.edu
Mon Sep 14 19:50:54 UTC 2015

On Fri, Sep 11, 2015 at 10:55 AM, Marc Haber <mh+dhcp-users at zugschlus.de> wrote:
> The issue is, why is the DHCP relay acting on a unicast packet that is
> addressed to the DHCP server? In my understanding, it is only supposed
> to act on broadcast packets. A unicast packet can (and is!) simply be
> routed, no relay needed here.

I agree this is the way most people would assume it works, and it does
seem to be a poor design choice, but I think it's the intended
behavior of dhcrelay to also relay unicast relay packets; which is why
I mentioned the "-m discard" option.

At the end of the day, the design of dhcrelay is very poor we just
have no alternatives.

Ray Patrick Soucy
Network Engineer I
Networkmaine, University of Maine System US:IT


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