eth0: not responding (recovering)

Surya Teja suryateja042 at
Wed Oct 9 17:32:24 UTC 2019

I am facing weird situation with fail over setup on my lab environment. I
am facing issue when the failover dhcp appliance is added to my existing
For the first time when i add failover to primary appliance,  On primary
appliance lease file i see the partner state as unknown and in the failover
the messages are printing not responding recovery, so i shutdown the
failover appliance and removed the failover config section from primary and
restarted primary then it was working fine.
As a trial of second attempt i increased mclt value to 3600 and added the
failover section back to primary config and bring up the failover server
The environment became most problematic none of the servers are granting
leases to devices On the primary lease file it says
my state partner-down
peer state recovery

Why do we get these recovery,partner down, unknown status when i add the
failover to my environment?
Or do we have any best practice steps how to add failover to existing
server without causing any outages?

Any help would be appreciated

On Sun, 6 Oct 2019, 21:04 Surya Teja, <suryateja042 at> wrote:

> Hi Bill Thanks for your reply,
> Yes I see traffic on the peer ports which i mentioned in the fail over
> section of my configuration file.
> My mclt value is 1800(30 min).
> I am seeing these issues on the failover server and some times I see the
> logs saying peer hold all free leases, but that scope is not completely
> full with active entries in the file of that specified server
> And one more strange thing I observerd in the lease file. In the file I
> have statements like my status and peer status. In that peer status is
> saying *unknown*
> When will this happen? In general scenario it should be normal that is
> what i got from internet, but the state is not getting updated in the lease
> file.
> On Sat, 5 Oct 2019, 21:16 Bill Shirley, <bill at>
> wrote:
>> Assuming you're referring to DHCP failover, is there any traffic flow on
>> the
>> port and peer port in the failover stanza?
>> What is your value for mclt?
>> Which server, primary or secondary, is giving the recovering message?
>> Bill
>> On 10/5/2019 9:33 AM, Surya Teja wrote:
>> Hi I have an issue in the lease flow with isc dhcp service. In the logs
>> it is printing  * eth0: not responding (recovering) *
>> My local is set up with active-active mode(splt value as 50-50%) and
>> because of some reason one of the appliance  went down for some duration. I
>> observed this and i bring it up, and duration of down is nearly 15hr.
>> After i bring it up. I am seeing the logs saying not responding
>> (recovering). Its been more than two hours still I am getting the same
>> logs
>> Does any one have any idea about this scenario and how to get the
>> environment stable
>> _______________________________________________
>> dhcp-users mailing listdhcp-users at lists.isc.org
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