DHCP Relay agent not forwarding messages to the client

[Sean McMurray]

I have zero experience with dhcp failover, but I agree with Gero. They 
should not both make offers.

If they are both making offers, what is the point of configuring them in 
failover? You might as well set them up independent of each other and 
have them serve different pools.

What am I missing?

On 06/16/2015 08:18 AM, Gero Palacio wrote:
> Hi There.
>
> What I find odd is that according to section 5.3 of this document IETF 
> Internet Draft - DHCP Failover Protocol 
> <https://tools.ietf.org/pdf/draft-ietf-dhc-failover-12.pdf> *only one* 
> of the servers should respond to the DHCP offer. The other should 
> discard it.
>
> I have tested this behavior with 2 computers connected on the same 
> subnet as the DHCP servers (so no relay agent involved) and it works 
> as described. Both servers receives the offer but only one of them 
> responds with an offer. This is also back up by RFC 3074 DHC Load 
> Balancing Algorithm <https://tools.ietf.org/html/rfc3074>:
>
>     _Section 4: _
>     The proposal maps the STID into a hash value using the function
>     in section 6.  The resulting hash value can then be used to decide who
>     should respond to the request, or who the forwarding target should be.
>
>
> So I don't why it's behaving the way it does when there's a relay 
> agent involved.
>
> Thanks all for your help!
> - Gerónimo.
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