R: R: DNS dynamic update with DHCPD 3.1.3

Thu Jan 7 14:45:51 UTC 2010

Hmm, I forget the order of updates, but it might try to do the update
to the in-addr.arpa zone before the localtrain zone. Do you have
entries for the in-addr.arpa zones in dhcpd.conf and named.conf?

You'll need to add logging to bind to get more information. All dhcpd
will get is a timeout because bind ignores the request.

regards,
-glenn

>Date: Thu, 7 Jan 2010 14:30:48 +0100
>From: "Autuori Gianluigi" <Autuori.Gianluigi.Wintime at ansaldobreda.it>
>
>in dhcpd.log i find this
>dhcpd: Unable to add forward map from OEM-HE9IZ08G3GB.localtrain to 10.10.1.21: 
bad DNS key 
>
>-----Messaggio originale-----
>Da: dhcp-users-bounces+autuori.gianluigi.wintime=ansaldobreda.it at lists.isc.org 
[mailto:dhcp-users-bounces+autuori.gianluigi.wintime=ansaldobreda.it at lists.isc.o
rg] Per conto di Glenn Satchell
>Inviato: giovedì 7 gennaio 2010 12.23
>A: dhcp-users at lists.isc.org
>Oggetto: Re: R: DNS dynamic update with DHCPD 3.1.3
>
>
>>Date: Thu, 7 Jan 2010 09:15:46 +0100
>>From: "Autuori Gianluigi" <Autuori.Gianluigi.Wintime at ansaldobreda.it>
>>
>>Thank you,
>>these are lines of my dhcpd.conf
>>
>>ddns-update-style interim;
>>
>>key DHCP_UPDATER {
>>    algorithm hmac-md5;
>>    secret pRP5FapFoJ95JEL06sv4PQ==;
>>};
>>
>>zone localtrain. {
>>    primary 127.0.0.1;
>>    key DHCP_UPDATER;    
>>}
>>
>>update-static-leases on;
>>
>>
>>and these one from named.conf.local
>>
>>key DHCP_UPDATER {
>>    algorithm hmac-md5;
>>    secret pRP5FapFoJ95JEL06sv4PQ==;
>>};
>>
>>zone "localtrain" {
>>    type master;
>>    file "/etc/bind/db.train.com";
>>    allow-update { key DHCP_UPDATER; }; };
>>
>>after then I restarted dhcpd and bind9 but db.train.com doesn't change.
>>
>>what is wrong?
>>
>>-----Messaggio originale-----
>>Da: 
>>dhcp-users-bounces+autuori.gianluigi.wintime=ansaldobreda.it at lists.isc.
>>org
>[mailto:dhcp-users-bounces+autuori.gianluigi.wintime=ansaldobreda.it at lists.isc.
o
>rg] Per conto di Simon Hobson
>>Inviato: martedì 5 gennaio 2010 15.37
>>A: Users of ISC DHCP
>>Oggetto: Re: DNS dynamic update with DHCPD 3.1.3
>>
>>Autuori Gianluigi wrote:
>>>I configured dhcp server and now I want to update database of dns
>>>(BIND9) every time dhcp server assigns an ip to  new device.
>>>how can I do it?
>>
>>Start with 'man dhcpd.conf' and see the section on dynamic DNS 
>>updating. It's
>quite easy to set up - but be careful about the subtle differences in use of 
quotes between dpcdp and bind.
>>
>>If, when you've read the man pages, there is anything you don't 
>>understand, or
>if it's not working properly, then pop back here and we'll be happy to help.
>>
>
>The syntax you have included seems to be ok.
>
>Ok, a few things to try:
>
>Did you restart bind and dhcpd after updating the files? Were there any 
warnings or errors from the startup?
>
>If you use nsupdate and that key can you update the zone file?  If so then this 
eliminates the key and the update mechanism.
>
>Turn on logging for bind to see if there are any updates coming through and 
being dropped. By default bind will silently ignore any updates if there is 
something not right in the configuration
>
>Is there anything in the dhcp syslog output indicating an attempt at updating 
DNS?
>
>The key you included is from the dhcpd.conf file. I am not sure if that is a 
valid key, so you may want to generate a new key.
>
>Usually it is something "odd" about your environment that causes problems. 
Typically this should "just work".
>
>regards,
>-glenn
>
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