Setting up DHCP Failover

[Bob Harold]

You might try adding "always-broadcast true;" to the dhcp server.  If you
are using DHCP forwarding (ip helpers), we have found that some
combinations of Cisco vs Juniper routers and Windows vs Mac pc's won't work
without that setting.  I don't recommend using it if you don't need it
because it causes more broadcast traffic.



-- 
Bob Harold
hostmaster, UMnet, ITcom
Information and Technology Services (ITS)
rharolde at umich.edu
734-647-6524 desk

On Tue, Oct 28, 2014 at 11:24 AM, Jonathan Labbé <jlabbe at neonova.net> wrote:

> Good to know.  I will look into 4.2+ as well then while doing my tests.
> Currently trying to work through why my devices are not getting an IP even
> though the server is getting the discover and sending the offer.
>
> -Jonathan
>
> On Tue, Oct 28, 2014 at 11:03 AM, Gregory Sloop <gregs at sloop.net> wrote:
>
>>
>>
>>
>>
>>  Holy smokes.  The second you say that, and I look at my config I see I
>> missed declaring peer port... wow, I have looked at this for almost a week
>> and for the life of me could not figure it out.  Consider hand slapped to
>> forehead, and that's what fixed it.
>>
>> Thanks!
>>
>> On Tue, Oct 28, 2014 at 10:46 AM, Gregory Sloop <gregs at sloop.net> wrote:
>>
>>
>>
>> You need a "port" which is the port this DHCP server uses to listen for
>> peer updates, AND [missing] a
>> "peer port" which is what the other peer will use to listen.
>>
>> See:
>> https://kb.isc.org/article/AA-00502/0/A-Basic-Guide-to-Configuring-DHCP-Failover.html
>>
>> My guess is, they won't talk because you haven't configured the port/peer
>> port directives properly.
>> [At least that's what jumps out at me.]
>>
>> HTH
>>
>> -Greg
>>
>> It seems to me that there were problems/bugs with 4.1 and failover. [I
>> seem to recall seeing posts on-list about it, but don't wager large sums of
>> money on it...]
>> There are also some very nice features in 4.2.4+ {IIRC] versions that
>> make failover work better in quite a number of situations. [A couple of new
>> options]
>>
>> You might consider using something 4.2+.
>>
>> -Greg
>>
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>> dhcp-users at lists.isc.org
>> https://lists.isc.org/mailman/listinfo/dhcp-users
>>
>
>
>
> --
> Jonathan Labbé
> Systems Engineer
> NeoNova Network Services
> jlabbe at neonova.net
> 919-460-3330
>
>
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>
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