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Today's Topics:
1. How to configure isc-dhcpd-server to update reverse zone
without client pre configuration? (Vladimir Skubriev)
2. cutover from conf file to ldap (Brendan Kearney)
----------------------------------------------------------------------
Message: 1
Date: Wed, 18 May 2016 16:27:40 +0300
From: Vladimir Skubriev <skubr...@cvisionlab.com>
To: dhcp-users@lists.isc.org
Subject: How to configure isc-dhcpd-server to update reverse zone
without client pre configuration?
Message-ID:
<caggnakryjkwqow6jec73c9uk7xmv9g1avk6reoxej3_pkf5...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
How to configure isc-dhcpd-server to update reverse zone without client pre
configuration?
I'm trying to set up isc-dhcpd-server from ubuntu 16.04 (4.3.3-5ubuntu12)
to configuring heterogeneous network with ubuntu, windows, macos, other ip
devices.
I'm already setuped bind to store ip address configuration of statically
configured hosts in dns. My internal zone already has an A records like:
client.example.lab a 900 192.168.1.10
server.example.lab a 900 192.168.1.11
Also I have statically defined hosts on dhcpd.conf like:
host client {
hardware ethernet: 08:00:27:d8:78:e5
fixed-address client;
}
I don't want to update A records in my internal zone example.lab
dynamically. Because this setup requires sustained attention to clean up
zones because of update errors like 'YXDOMAIN, NXRRSET etc'
I want to update dynamically only reverse zone of my internal subnet
192.168.1.0/24
So I configured the dhcpd server as follows:
ddns-updates on;
do-forward-updates off;
The documentation states that:
do-forward-updates flag;
...
If this statement is used to disable forward updates, the DHCP server will
never attempt to update the client's A record, and will only ever attempt
to update the client's PTR record if the client supplies an FQDN that
should be placed in the PTR record using the fqdn option.
I tried to setup this option manually on ubuntu in /etc/dhcp/dhclient.conf
as follows:
send fqdn.fqdn = "client.example.lab"
In this case dhcpd server succesfully updates reverse PTR zone with this
fqdn name. Also it is point the obtained ip to this fqdn name.
But this workflow assumes that I need to configure each client in the net.
Is there another way to configure isc-dhcp-server for retrive fqdn.fqdn
from the server itself, without client pre-configuration?
Is it is impossible now with isc-dhcp-server ?
--
Faithfully yours,
CVision Lab System Administrator
Vladimir Skubriev
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Message: 2
Date: Wed, 18 May 2016 19:17:25 -0400
From: Brendan Kearney <bpk...@gmail.com>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: cutover from conf file to ldap
Message-ID: <573cf805.4010...@gmail.com>
Content-Type: text/plain; charset=utf-8; format=flowed
running fedora 20, dhcp 4.2.7 (i will be upgrading to f24 shortly after
it comes out)
i have put a bunch of effort into setting up ldap to house my configs
and all of the directives in my conf file(s) are in ldap at this point.
if i run the below:
dhcpd -4 -f -t -cf /etc/dhcp/dhcpd.conf.ldap bond0
i get:
Internet Systems Consortium DHCP Server 4.2.7
Copyright 2004-2014 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/
it seems that no issues exist in the config, as housed in ldap. if i
run the same command with a -T, to test the leases file, every IP in all
subnets, pools, etc is reported with the below line:
lease 192.168.xxx.xxx: no subnet.
the subnet definition exists in ldap, so i dont know what this might
be. a nuance with the lease file, maybe? any pointers would be
appreciated.
now, when i cutover from conf files to ldap, what is the proper
procedure? i tried to do so already, and all sorts of problems came
from it. existing leases were getting NAK responses for renewals, and
new leases were not being given out. i even wound up with "peer holds
all free leases" errors from both servers.
i stopped both instances, changed the conf files from static files to a
config pointing to ldap for configs, and started one instance. i waited
a minute or so and started the second instance.
i also stopped both instances and removed the leases files from both
servers and restarted. in no scenario was i able to get leases to start
being handed out. because the network is a lab network, i dont have any
real requirement for things to stay online at all times.
am i missing something in my approach? are there best practices to
perform such a change?
thanks in advance,
brendan
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