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Today's Topics:
1. DDNS updates for secondary DNS server (Kraishak Mahtha)
2. Re: DDNS updates for secondary DNS server
(glenn.satch...@uniq.com.au)
3. Re: DDNS updates for secondary DNS server (kraishak)
----------------------------------------------------------------------
Message: 1
Date: Tue, 27 Apr 2021 13:03:50 +0530
From: Kraishak Mahtha <kraishak....@gmail.com>
To: dhcp-users@lists.isc.org
Subject: DDNS updates for secondary DNS server
Message-ID:
<caddat84ab-340fjpnrkog50p_atpdbym0kdwxxmy72-9ust...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Hi All,
zone example.com.
{
primary 192.168.0.45;
secondary 192.168.0.47;
}
I have noticed that DHCP is not sending any DDNS updates to the secondary
DNS server(192.168.0.47) of the zone when the primary is down for some
reason, is this the expected behavior?
Getting below error
Unable to add forward map from n54c5-000001.example.com to 192.168.0.86:
NOTIMP
Does any one have any idea/experience of DDNS flow when primary DNS server
is down
Thanks in Advance
Kraishak
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Message: 2
Date: Tue, 27 Apr 2021 18:06:11 +1000
From: glenn.satch...@uniq.com.au
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: DDNS updates for secondary DNS server
Message-ID: <d4a99ac500aefa152638dbdf04862...@uniq.com.au>
Content-Type: text/plain; charset=US-ASCII; format=flowed
Hi Kraishak
My understanding is that each time the DHCP server renews a lease it
will try to update the DNS server if the record does not exist. So this
could take some time to catch up if the DNS server is down. I don't
think it tries to ever update the secondary - this is the job of the
primary. For this reason a lot of sites implement the dhcp server on the
same box as the dns server.
Also looks like something in your DNS config may not be quite right. In
dhcp your primary is 192.168.0.45, but it is trying to update
192.168.0.86 and gets an error. Can you check through both the dhcp and
dns configuration to see if you mention 192.168.0.86 anywhere?
regards,
Glenn
On 2021-04-27 17:33, Kraishak Mahtha wrote:
> Hi All,
>
> zone example.com [1].
> {
> primary 192.168.0.45;
> secondary 192.168.0.47;
> }
> I have noticed that DHCP is not sending any DDNS updates to the
> secondary DNS server(192.168.0.47) of the zone when the primary is
> down for some reason, is this the expected behavior?
>
> Getting below error
> Unable to add forward map from n54c5-000001.example.com [2] to
> 192.168.0.86 [3]: NOTIMP
>
> Does any one have any idea/experience of DDNS flow when primary DNS
> server is down
>
> Thanks in Advance
> Kraishak
>
>
> Links:
> ------
> [1] http://example.com
> [2] http://n54c5-000001.example.com
> [3] http://192.168.0.86
> _______________________________________________
> ISC funds the development of this software with paid support
> subscriptions. Contact us at https://www.isc.org/contact/ for more
> information.
>
> dhcp-users mailing list
> dhcp-users@lists.isc.org
> https://lists.isc.org/mailman/listinfo/dhcp-users
------------------------------
Message: 3
Date: Tue, 27 Apr 2021 04:30:01 -0500 (CDT)
From: kraishak <kraishak....@gmail.com>
To: dhcp-users@lists.isc.org
Subject: Re: DDNS updates for secondary DNS server
Message-ID: <1619515801323-0.p...@n4.nabble.com>
Content-Type: text/plain; charset=us-ascii
Hi Glenn
Thanks for reply,
zone example.com.
{
primary 192.168.0.45;
secondary 192.168.0.47;
}
I don't, think it tries to ever update the secondary
-----> So in a sample zone section adding secondary statement is of no
significant even if we add the valid secondary DNS server it will send
updated only to primary and if primary is down it will throw exceptions
unable to add forward/reverse map but it won't use the secondary server
definition from the zone section in dhcpd.conf, Please correct me if I am
wrong.
Also looks like something in your DNS config may not be quite right. In
dhcp your primary is 192.168.0.45, but it is trying to update
192.168.0.86 and gets an error.
----> 192.168.0.86 was the client IP which the DHCP server gave to the
client from scope range
In a valid case when the primary is up, I am getting messages like below
Added new forward map from n0001-000001.example.com to 192.168.0.97 where
192.168.0.97 was the client IP
so I guess it is not issue with config
Thanks
Kraishak
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