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Today's Topics:
1. Re: DDNS updates for secondary DNS server (kraishak)
2. Re: DDNS updates for secondary DNS server
(glenn.satch...@uniq.com.au)
3. Re: DDNS updates for secondary DNS server (kraishak)
4. Re: DDNS updates for secondary DNS server (Rob Janssen)
----------------------------------------------------------------------
Message: 1
Date: Thu, 29 Apr 2021 01:24:23 -0500 (CDT)
From: kraishak <kraishak....@gmail.com>
To: dhcp-users@lists.isc.org
Subject: Re: DDNS updates for secondary DNS server
Message-ID: <1619677463278-0.p...@n4.nabble.com>
Content-Type: text/plain; charset=us-ascii
Hi Gelnn,
- Check your secondary is configured to accept updates from the dhcp
server.
-----> yes it is working fine when I flip the secondary as primary and
primary as secondary and respective changes on the dhcpd.conf also, By this
I guess there is no issue with secondary server receiving updates from DHCP
server
- Turn on logging of updates on the secondary to see if anything is
sent.
- Run a packet trace on the secondary to look at network traffic to see
if anything is sent to it.
-------> Here I am using the Windows servers as DNS, but when I searched in
forums some of them suggest saying to have an allow-update-forwarding option
on slave zone which can update primary,
I am checking if we have any equivalent on the windows server
Thanks
Kraishak
--
Sent from: http://isc-dhcp-users.2343191.n4.nabble.com/
------------------------------
Message: 2
Date: Thu, 29 Apr 2021 17:26:59 +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: <d721f05325d028f27661ef2cfb333...@uniq.com.au>
Content-Type: text/plain; charset=US-ASCII; format=flowed
Can you run tcpdump or wireshark on the dhcp server looking for packets
between the dhcp server and the dns servers?
regards,
Glenn
On 2021-04-29 16:24, kraishak wrote:
> Hi Gelnn,
>
> - Check your secondary is configured to accept updates from the dhcp
> server.
> -----> yes it is working fine when I flip the secondary as primary and
> primary as secondary and respective changes on the dhcpd.conf also, By
> this
> I guess there is no issue with secondary server receiving updates from
> DHCP
> server
>
> - Turn on logging of updates on the secondary to see if anything is
> sent.
> - Run a packet trace on the secondary to look at network traffic to see
> if anything is sent to it.
> -------> Here I am using the Windows servers as DNS, but when I
> searched in
> forums some of them suggest saying to have an allow-update-forwarding
> option
> on slave zone which can update primary,
>
> I am checking if we have any equivalent on the windows server
>
> Thanks
> Kraishak
>
>
>
>
>
> --
> Sent from: http://isc-dhcp-users.2343191.n4.nabble.com/
> _______________________________________________
> 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: Thu, 29 Apr 2021 04:56:19 -0500 (CDT)
From: kraishak <kraishak....@gmail.com>
To: dhcp-users@lists.isc.org
Subject: Re: DDNS updates for secondary DNS server
Message-ID: <1619690179782-0.p...@n4.nabble.com>
Content-Type: text/plain; charset=us-ascii
I tried tcpdump, I can see lot of other traffic when I was searching to
filter DDNS packets I found the below one
" tcpdump 'udp[0xa] & 0x78 = 0x28'"
Case1) when both primary and secondary DNS server are up and running
I see the packets flowing from my DHCP server to DNS primary server
tcpdump 'udp[0xa] & 0x78 = 0x28'
09:36:25.836650 IP dhcpremote.36057 > 192.168.0.45.domain: 32269 update [1a]
[2n] SOA? tst.com. (113)
09:36:25.838185 IP 192.168.0.45.domain > dhcpremote.36057: 32269 update-
1/2/0 (Class 254) ANY (113)
09:36:25.840153 IP dhcpremote.36057 > 192.168.0.45.domain: 37754 update [1a]
[2n] SOA? tst.com. (113)
09:36:25.840716 IP 192.168.0.45.domain > dhcpremote.36057: 37754 update-
1/2/0 (Class 254) ANY (113)
09:36:25.842929 IP dhcpremote.36057 > 192.168.0.45.domain: 50378 update [1a]
[2n] SOA? tst.com. (113)
09:36:25.843558 IP 192.168.0.45.domain > dhcpremote.36057: 50378 update-
1/2/0 (Class 254) ANY (113)
09:36:25.935787 IP dhcpremote.36057 > 192.168.0.45.domain: 45452 update [1a]
[2n] SOA? tst.com. (113)
09:36:25.936482 IP 192.168.0.45.domain > dhcpremote.36057: 45452 update-
1/2/0 (Class 254) ANY (113)
09:36:25.937238 IP dhcpremote.36057 > 192.168.0.45.domain: 57717 update [1a]
[2n] SOA? tst.com. (113)
09:36:25.937644 IP 192.168.0.45.domain > dhcpremote.36057: 57717 update-
1/2/0 (Class 254) ANY (113)
I can see DNS records get added to the zone on primary DNS server
Case2)I stopped primary DNS server and only secondary is running
At this time initially I saw the traffic trying to communicate to primary
and later it tried to communicate to secondary also but on the secondary
server I don't see any updates for that zone
9:47:50.448729 IP dhcpremote.36057 > 192.168.0.45.domain: 28079 update [1a]
[2n] SOA? tst.com. (113)
09:47:50.450722 IP dhcpremote.36057 > 192.168.0.45.domain: 56210 update [1a]
[2n] SOA? tst.com. (113)
09:47:50.452350 IP dhcpremote.36057 > 192.168.0.45.domain: 35555 update [1a]
[2n] SOA? tst.com. (113)
09:47:50.454332 IP dhcpremote.36057 > 192.168.0.45.domain: 6159 update [1a]
[2n] SOA? tst.com. (113)
09:47:50.456659 IP dhcpremote.36057 > 192.168.0.45.domain: 46788 update [1a]
[2n] SOA? tst.com. (113)
09:47:53.451803 IP dhcpremote.36057 > 192.168.0.45.domain: 28079 update [1a]
[2n] SOA? tst.com. (113)
09:47:53.451882 IP dhcpremote.36057 > 192.168.0.45.domain: 56210 update [1a]
[2n] SOA? tst.com. (113)
09:47:53.452444 IP dhcpremote.36057 > 192.168.0.45.domain: 35555 update [1a]
[2n] SOA? tst.com. (113)
09:47:53.454400 IP dhcpremote.36057 > 192.168.0.45.domain: 6159 update [1a]
[2n] SOA? tst.com. (113)
09:47:53.456731 IP dhcpremote.36057 > 192.168.0.45.domain: 46788 update [1a]
[2n] SOA? tst.com. (113)
09:47:56.452149 IP dhcpremote.36057 > 192.168.0.45.domain: 28079 update [1a]
[2n] SOA? tst.com. (113)
09:47:56.452188 IP dhcpremote.36057 > 192.168.0.45.domain: 56210 update [1a]
[2n] SOA? tst.com. (113)
09:47:56.452542 IP dhcpremote.36057 > 192.168.0.45.domain: 35555 update [1a]
[2n] SOA? tst.com. (113)
09:47:56.454501 IP dhcpremote.36057 > 192.168.0.45.domain: 6159 update [1a]
[2n] SOA? tst.com. (113)
09:47:56.456806 IP dhcpremote.36057 > 192.168.0.45.domain: 46788 update [1a]
[2n] SOA? tst.com. (113)
09:47:59.455189 IP dhcpremote.36057 > 192.168.0.45.domain: 56210 update [1a]
[2n] SOA? tst.com. (113)
09:47:59.455220 IP dhcpremote.36057 > 192.168.0.45.domain: 28079 update [1a]
[2n] SOA? tst.com. (113)
09:47:59.455229 IP dhcpremote.36057 > 192.168.0.45.domain: 35555 update [1a]
[2n] SOA? tst.com. (113)
09:47:59.455241 IP dhcpremote.36057 > 192.168.0.45.domain: 6159 update [1a]
[2n] SOA? tst.com. (113)
09:47:59.456869 IP dhcpremote.36057 > 192.168.0.45.domain: 46788 update [1a]
[2n] SOA? tst.com. (113)
09:48:02.458314 IP dhcpremote.36057 > 192.168.0.47.domain: 2904 update [1a]
[2n] SOA? tst.com. (113)
09:48:02.458409 IP dhcpremote.36057 > 192.168.0.47.domain: 51837 update [1a]
[2n] SOA? tst.com. (113)
09:48:02.458463 IP dhcpremote.36057 > 192.168.0.47.domain: 33836 update [1a]
[2n] SOA? tst.com. (113)
09:48:02.458501 IP dhcpremote.36057 > 192.168.0.47.domain: 64762 update [1a]
[2n] SOA? tst.com. (113)
09:48:02.458578 IP dhcpremote.36057 > 192.168.0.47.domain: 58373 update [1a]
[2n] SOA? tst.com. (113)
09:48:02.461798 IP 192.168.0.47.domain > dhcpremote.36057: 2904 update
NotImp- 1/2/0 (Class 254) ANY (113)
09:48:02.462583 IP 192.168.0.47.domain > dhcpremote.36057: 33836 update
NotImp- 1/2/0 (Class 254) ANY (113)
09:48:02.463148 IP 192.168.0.47.domain > dhcpremote.36057: 64762 update
NotImp- 1/2/0 (Class 254) ANY (113)
09:48:02.463678 IP 192.168.0.47.domain > dhcpremote.36057: 58373 update
NotImp- 1/2/0 (Class 254) ANY (113)
09:48:02.464209 IP 192.168.0.47.domain > dhcpremote.36057: 51837 update
NotImp- 1/2/0 (Class 254) ANY (113)
While it is trying to communicate to secondary I can see some different in
packet like "update NotImp " not sure if that means anything to debug
--
Sent from: http://isc-dhcp-users.2343191.n4.nabble.com/
------------------------------
Message: 4
Date: Thu, 29 Apr 2021 13:42:54 +0200
From: Rob Janssen <pe1...@amsat.org>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: DDNS updates for secondary DNS server
Message-ID: <5734e64b06ca78993a734c6671181...@amsat.org>
Content-Type: text/plain; charset=US-ASCII; format=flowed
When you think the normal updating mechanism is not working according to
your preferences, you can always disable it and instead configure "on
commit", "on release" and "on expiry" actions that execute an external
script that does exactly what you want.
------------------------------
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