[CentOS] ISC DHCP failover

Wed Sep 23 20:28:44 UTC 2015
Jo Rhett <jrhett at netconsonance.com>

As I understand their fallback that is the design idea — they each hand out diverse ranges…

On Sep 23, 2015, at 12:49 PM, Chris Adams <linux at cmadams.net> wrote:
> Anybody have any experience with setting up dhcpd in failover mode
> between two servers?  I set this up on a couple of servers, and it seems
> to be working, but I don't think it is working "right".  It appears both
> servers are replying to all requests (which for renewals works okay
> because they both give the same address, but new requests get two
> different responses).  I thought that only one server would reply to a
> particular request.
> Also, every DHCPACK is followed by a message like this in the log:
> Sep 23 15:45:50 rad2 dhcpd: bind update on x.x.x.x from mypeer rejected: incoming update is less critical than outgoing update
> Any ideas?  I subscribed and asked over on the ISC-operated dhcp-users
> list but haven't had any responses.  Google finds others asking about
> the same log message, and the only responses seem to be "well, if you
> get it for every update, there's probably some configuration issue" (but
> nobody ever says what issue might lead to it).
> -- 
> Chris Adams <linux at cmadams.net>
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Jo Rhett
Net Consonance : net philanthropy to improve open source and internet projects.