How to configure isc-dhcpd-server to update reverse zone without client pre configuration?

[Vladimir Skubriev]

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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[Bill Shirley]

Maybe:
group {
    use-host-decl-names on;
    option fqdn.fqdn = concat(config-option server.ddns-hostname, ".", config-option server.ddns-domainname);

    host client {
        hardware ethernet: 08:00:27:d8:78:e5
        fixed-address client.example.lab;
    }
    host server {
        hardware ethernet: xx:xx:xx:xx:xx:xx
        fixed-address server.example.lab;
    }
}

Bill

On 5/18/2016 9:27 AM, Vladimir Skubriev wrote:

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

_______________________________________________
dhcp-users mailing list
[hidden email]
https://lists.isc.org/mailman/listinfo/dhcp-users

_______________________________________________
dhcp-users mailing list
[hidden email]
https://lists.isc.org/mailman/listinfo/dhcp-users

[Vladimir Skubriev]

Thank you. I tried your solution.

It does not resolv an issue. Reverse zone update not occurs, until the client is configured with fqdn.fqdn

2016-05-19 22:40 GMT+03:00 Bill Shirley <[hidden email]>:

Maybe:
group {
    use-host-decl-names on;
    option fqdn.fqdn = concat(config-option server.ddns-hostname, ".", config-option server.ddns-domainname);

    host client {
        hardware ethernet: 08:00:27:d8:78:e5
        fixed-address client.example.lab;
    }
    host server {
        hardware ethernet: xx:xx:xx:xx:xx:xx
        fixed-address server.example.lab;
    }
}

Bill

On 5/18/2016 9:27 AM, Vladimir Skubriev wrote:

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

_______________________________________________
dhcp-users mailing list
[hidden email]
https://lists.isc.org/mailman/listinfo/dhcp-users

_______________________________________________
dhcp-users mailing list
[hidden email]
https://lists.isc.org/mailman/listinfo/dhcp-users

--

_______________________________________________
dhcp-users mailing list
[hidden email]
https://lists.isc.org/mailman/listinfo/dhcp-users