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Today's Topics:
1. Re: DDNS updates for zone having multiple primary servers
(Simon Hobson)
2. Re: DDNS updates for zone having multiple primary servers
(kraishak)
3. Re: DDNS updates for zone having multiple primary servers
(Simon Hobson)
4. Re: DDNS updates for zone having multiple primary servers
(kraishak)
----------------------------------------------------------------------
Message: 1
Date: Thu, 1 Apr 2021 20:17:24 +0100
From: Simon Hobson <dh...@thehobsons.co.uk>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: DDNS updates for zone having multiple primary servers
Message-ID: <99e27de9-cfd3-41f1-ba58-4bb040523...@thehobsons.co.uk>
Content-Type: text/plain; charset=us-ascii
glenn.satch...@uniq.com.au wrote:
> My understanding from a long time ago (as in >5 years) was that that dynamic
> dns updates are only sent to the primary DNS server. The primary is expected
> to forward to all the secondaries.
I've not seen anything to suggest that has changed.
In the absence of a zone declaration, the primary DNS server is determined by
looking at the SOA record for the zone - so without keys setup, a correctly
configured DNS setup will automagically get updates as long as updates are
allowed (e.g. by IP address). If a zone declaration is present, then the server
specified in that is used.
Simon
------------------------------
Message: 2
Date: Thu, 1 Apr 2021 23:25:00 -0500 (CDT)
From: kraishak <kraishak....@gmail.com>
To: dhcp-users@lists.isc.org
Subject: Re: DDNS updates for zone having multiple primary servers
Message-ID: <1617337500022-0.p...@n4.nabble.com>
Content-Type: text/plain; charset=us-ascii
Hi Glenn,
Thanks for your explanation about the "option domain-name" and
"ddns-domainname", So based on my network-level setup we configure this
values, these values can be same or can be different
And want to confirm one more point that the zone section will be added only
for the "ddns-domainname" value am i right ?
Thanks
Kraishak
--
Sent from: http://isc-dhcp-users.2343191.n4.nabble.com/
------------------------------
Message: 3
Date: Fri, 2 Apr 2021 10:12:46 +0100
From: Simon Hobson <dh...@thehobsons.co.uk>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: DDNS updates for zone having multiple primary servers
Message-ID: <2fc63942-cc7e-4a96-b762-19ea3ab5e...@thehobsons.co.uk>
Content-Type: text/plain; charset=us-ascii
kraishak <kraishak....@gmail.com> wrote:
> Thanks for your explanation about the "option domain-name" and
> "ddns-domainname", So based on my network-level setup we configure this
> values, these values can be same or can be different
Correct
> And want to confirm one more point that the zone section will be added only
> for the "ddns-domainname" value am i right ?
I don't quite understand the question here, however ...
The process the server will take is roughly :
Client gets a lease, the server will take it's hostname (whether provided by
the client, or provided by the config (e.g. in a host declaration)) and join it
with ddns-domainname to form a FQDN for the client.
IFF an existing lease record indicates that DNS updates have already been done
for this client&FQDN (and the server hasn't been told to always do updates),
then that's it. Otherwise ...
It will then lookup the primary server for the client's domain. If there is a
matching zone statement, then it will use the primary server specification
given there, if not then it will do a DNS lookup for the SOA record of the zone
and use the primary server specified in that.
The server will then attempt to do the DNS updates, which may fail if there are
clashes or stale data in the zone.
Simon
------------------------------
Message: 4
Date: Fri, 2 Apr 2021 05:26:05 -0500 (CDT)
From: kraishak <kraishak....@gmail.com>
To: dhcp-users@lists.isc.org
Subject: Re: DDNS updates for zone having multiple primary servers
Message-ID: <1617359165426-0.p...@n4.nabble.com>
Content-Type: text/plain; charset=us-ascii
Hi Simon
Thanks for reply,
>>I don't quite understand the question here, however ...
--->I am clear with zone section now, but have a doubt with domain-name
fields
> Thanks for your explanation about the "option domain-name" and
> "ddns-domainname", So based on my network-level setup we configure this
> values, these values can be same or can be different
>>>>Correct
Regarding this, I am sorry I didn't complete my question, Actually my doubt
was can we configure like below
subnet 192.168.0.0 netmask 255.255.255.0 {
pool {
range 192.168.0.50 192.168.0.150;
}
ddns-domainname "example.com";
option domain-name "test.com";
option routers 192.168.0.1;
option subnet-mask 255.255.255.0;
}
zone example.com.
{
primary 192.168.0.45;
secondary 192.168.0.47,192.168.0.48;
}
i.e option domain-name is different and ddns-domainname is totally
different not like domain and sub-domain concept
I checked the dhcpd syntax it is not giving any error but want to cross
check is this can be a valid configuration?
Thanks
Kraishak
--
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------------------------------
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